The Definitive Rolex Watch Caliber Reference
Welcome to the most comprehensive Rolex watch caliber reference available online. Whether you are a seasoned collector researching a vintage Cosmograph Daytona, a first-time buyer verifying the movement inside a Submariner, or a watchmaker seeking technical specifications, this guide provides the authoritative caliber data you need. Every Rolex movement listed below has been cross-referenced against official Rolex documentation, COSC certification records, and trusted horological sources to ensure accuracy.
Rolex has manufactured its own movements in-house since the late 1950s, beginning with the landmark Caliber 1030 — one of the first automatic movements featuring a bidirectional Perpetual rotor. In the decades since, Rolex has evolved through the legendary 1570 and 1575 series (the workhorses of the Datejust and Submariner through the 1960s–70s), the revolutionary Caliber 3035 (the brand's first high-beat men's movement with quickset date), and the iconic Caliber 3135 that served as the backbone of almost every modern Rolex for over 30 years. Today, the 32xx generation — including the 3230, 3235, 3255, and 3285 — represents the cutting edge of Rolex horology, featuring the patented Chronergy escapement, paramagnetic Parachrom Blue hairspring, and an extended 70-hour power reserve.
This Rolex movement guide covers every caliber family: vintage manual-wind chronograph movements (23VZ, 72-series), the full range of automatic calibers from early 400-series through the modern 32xx generation, dedicated chronograph calibers (4030, 4130, 4131, 4132), the specialized Sky-Dweller movements (9001, 9002), Rolex's collectible quartz Oysterquartz calibers, and the latest ladies' movements featuring the Syloxi hairspring. Each entry includes key specifications — jewel count, beat rate, power reserve, diameter, and introduction date — alongside model cross-references and collector notes.
For buyers and sellers of pre-owned Rolex watches, understanding the caliber inside a timepiece is essential for Rolex watch authentication, accurate valuation, and informed purchasing decisions. Use this guide to verify movement authenticity, estimate service needs, and identify which caliber powers your specific Rolex reference number. Explore our complete Rolex collection, use our Rolex serial number lookup guide to date your watch, or contact Experts Watches for personalized assistance.
Movement Overview: How Rolex Calibers Work
Core Components of a Rolex Movement
- Mainspring & Barrel — The power source. Modern Rolex mainsprings use a proprietary nickel-based alloy for consistent torque delivery throughout the full power reserve.
- Gear Train — Transmits energy from the mainspring barrel through a precision train of wheels to the escapement.
- Escapement — The regulating mechanism. Older calibers use a Swiss lever escapement; modern 32xx calibers feature the patented Chronergy escapement, which is 15% more energy-efficient.
- Oscillator (Balance Wheel & Hairspring) — Modern Rolex calibers use the Parachrom Blue hairspring (paramagnetic, shock-resistant) or the Syloxi hairspring (silicon-based, in ladies' models). The balance wheel oscillates at 28,800 vph (4 Hz) in modern calibers.
Common Complications
- Date — Instantaneous date change at midnight (Cal. 3135, 3235)
- Day-Date — Day at 12, date at 3 (Cal. 3155, 3255)
- GMT / Dual Time — Independent 24-hour hand (Cal. 3185, 3186, 3285)
- Chronograph — Stopwatch with sub-dials (Cal. 4030, 4130, 4131)
- Annual Calendar — Adjusts for month lengths (Cal. 9001, 9002 — Sky-Dweller)
- Small Seconds — Sub-dial at 6 o'clock (Cal. 7140 — 1908 line)
Superlative Chronometer Certification
Since 2015, every Rolex watch carries the Superlative Chronometer designation, guaranteeing accuracy of -2/+2 seconds per day — exceeding the COSC standard of -4/+6 sec/day. This certification covers accuracy after casing, power reserve, waterproofing, and self-winding efficiency.
How to Identify Your Rolex Caliber
Identification Methods
- Caseback removal — Caliber number engraved on the movement. Only a qualified watchmaker should open the case.
- Reference number lookup — Each Rolex reference corresponds to a specific caliber (e.g., Ref. 126610LN = Cal. 3235).
- Rehaut engraving — Post-2005 watches have serial and ROLEX engraved on the inner bezel ring.
- Official documentation — Warranty card and chronometer certificate list the caliber.
- Visual identification — Experienced watchmakers identify caliber family by rotor style, bridge layout, and date mechanism.
Red Flags for Counterfeit Movements
- Incorrect jewel count for the stated caliber
- Non-matching serial engraving quality or font
- Visible ETA or Miyota markings on a claimed Rolex movement
- Wrong beat rate — modern Rolex runs at 28,800 bph; 21,600 bph suggests a generic movement
- Missing Microstella regulating screws on the balance wheel (present on 31xx and 3035 calibers)
- Poor finishing — Rolex has a distinctive, clean industrial finish; counterfeits show rough edges
Service Intervals & Maintenance Guide
Recommended Service Intervals
- Vintage (pre-1970, Cal. 1030 and earlier) — Every 3–5 years. Older lubricants and sealing require frequent care.
- Classic (1970s–2000s, Cal. 1570, 3035, 3135) — Every 5–7 years. The 3135 family is durable but benefits from fresh lubrication.
- Modern (2015+, Cal. 32xx series) — Rolex recommends every ~10 years. Chronergy escapement and updated lubricants extend intervals.
- Quartz (Cal. 5035, 5055, etc.) — Battery every 3–5 years; full service every 7–10 years.
Common Replacement Parts & Service Notes
- Mainspring — Replaced at every full service. Genuine Rolex mainsprings are critical for proper power reserve.
- Gaskets & O-rings — Replaced at every service to maintain water resistance.
- Crystal — Sapphire crystals rarely need replacement; vintage acrylic crystals scratch more easily.
- Click spring — Winding mechanism component that can wear over time.
- Reverser wheels — Automatic winding components that wear in older calibers.
- Rotor bearings — Checked and replaced if worn during service.
- Balance staff — Can bend from shock impacts; requires replacement if damaged.
Compatibility Notes
- Cal. 3135 parts are not interchangeable with 3235 despite similar function — different escapement architecture.
- Cal. 1570/1575 share many components and are largely interchangeable within the 1500 family.
- Genuine Rolex parts are numbered and must match the specific caliber — aftermarket parts void authenticity.
- Vintage chronograph calibers (72-series, Valjoux-based) require specialized knowledge and original-spec parts.
Complete Rolex Caliber List
Vintage Chronograph Calibers
Rolex Valjoux Cal. 727 Vintage Chronograph Movement — Shop Vintage Chronographs
Type: Manual-wind chronograph Base: Valjoux 23 Size: 30mm × 5.85mm Jewels: 17 Beat Rate: 18,000 bph Introduced: 1947
Based on the Valjoux 23 column-wheel chronograph. Chronograph with minute recorder, round-shaped, 2-dial layout. Found in early Rolex chronograph references.
Type: Manual-wind chronograph Base: Valjoux 72 Size: 30mm × 6.95mm Jewels: 17 Beat Rate: 18,000 bph Introduced: 1961
Based on the Valjoux 72 column-wheel chronograph. Chronograph w/ hour recorder, shock protection, 3-dial layout. Base caliber “72A” engraved on hub sinking of balance wheel.
Models: Pre-Daytona chronograph references
Type: Manual-wind chronograph Base: Valjoux 72 Size: 30mm × 6.95mm Jewels: 17 Beat Rate: 18,000 bph Introduced: 1962
Based on Valjoux 72. Same as 72A with hairspring protection and Breguet overcoil hairspring added. Introduced the Rolex Microstella adjustable-inertia balance wheel. “72B” engraved on hub sinking of balance wheel. Completely replaced the 72A from 1966 onward.
Models: Cosmograph Daytona Ref. 6238, 6239 (early)
Type: Manual-wind chronograph w/ calendar Base: Valjoux 72C Size: 30mm × 6.95mm Jewels: 17 Beat Rate: 18,000 bph Introduced: 1962
Based on Valjoux 72C. Chronograph with hour recorder and calendar, shock protection, 3-dial. “72BC” or “72cB” on hub sinking.
Type: Manual-wind flyback chronograph Base: Valjoux 72 Size: 30mm × 6.95mm Jewels: 17 Beat Rate: 18,000 bph Introduced: 1939
Based on Valjoux 72. Chronograph with hour recorder, flyback function (start, stop & fly back to zero), shock protection, 3-dial.
Type: Manual-wind flyback chronograph w/ calendar Base: Valjoux 72 Size: 30mm × 6.95mm Jewels: 17 Beat Rate: 18,000 bph
Based on Valjoux 72. Flyback chronograph with calendar complication. Rare variant of the 72VZH.
Evolution of the Valjoux 72B. Replaced the 72B in Daytona production from approximately 1965. Column-wheel chronograph with horizontal clutch, Microstella regulation, and Breguet overcoil hairspring. The foundation of the Daytona legend.
Models: Cosmograph Daytona Ref. 6239, 6241, 6262
Based on Valjoux 727. Upgraded beat rate from 18,000 to 21,600 bph over the earlier 722, improving accuracy. Column-wheel chronograph with horizontal clutch. The last manual-wind Daytona movement before the switch to automatic (Cal. 4030) in 1988. Highly sought by collectors.
Models: Cosmograph Daytona Ref. 6263, 6265
Manual-Wind Calibers
Rolex Cal. 1600 Manual-Wind Movement — Shop Rolex Watches
Type: Manual-wind, no date Jewels: 17 Beat Rate: 18,000 bph Introduced: ~1957
Time-only 2-hand manual-wind caliber used in Cellini and Precision dress watches. No seconds hand. Slim profile designed for elegant thin-case references.
Models: Cellini, Precision — Ref. 3833, 3834, 4013
Type: Manual-wind, no date Jewels: 17 Beat Rate: 18,000 bph Introduced: ~1960
Updated variant of the 1600 manual-wind family. Used in Cellini and Precision dress references of the early 1960s. Slim, elegant movement for thin-case applications.
Models: Cellini, Precision — early 1960s references
Type: Manual-wind, no date Jewels: 17 Beat Rate: 18,000 bph Introduced: ~1962
Final variant of the 1600 manual-wind family. Used in Cellini and Precision dress watches through the 1960s. Shares the slim profile and 2-hand time-only display of the 1600/1601.
Models: Cellini, Precision — Ref. 3833, 4014
Early Automatic Calibers (400–780 Series)
Rolex Cal. 645 Early Automatic Movement — Bubble Back Era — Shop Automatic Watches
Type: Automatic, no date Beat Rate: 18,000 bph Introduced: 1941
One of Rolex's earliest in-house automatic movements. Unidirectional rotor winding. Used in early Oyster Perpetual references from the 1940s.
Models: Oyster Perpetual — early 1940s references
Type: Automatic, no date Beat Rate: 18,000 bph Introduced: 1936
Early automatic movement from the pre-war era. Predecessor to the 620 family. Used in Oyster Perpetual Bubble Back references.
Models: Oyster Perpetual Bubble Back
Type: Automatic, no date Beat Rate: 18,000 bph Introduced: 1936
Early automatic movement used in Bubble Back references. Contemporary of the 520 family.
Models: Oyster Perpetual Bubble Back — Ref. 5006
Type: Automatic, no date Beat Rate: 18,000 bph Introduced: 1931
Rolex's first truly successful bidirectional automatic rotor movement. The foundation of the Perpetual system. Powers the iconic Bubble Back — named for the enlarged caseback required to house the rotor. Highly collectible.
Models: Oyster Perpetual Bubble Back — Ref. 2764, 2768, 2940, 3065, 3130, 3131, 3134, 3348, 3353, 3372, 3435, 3539, 3548, 3716, 5006, 5015
Type: Automatic, no date Beat Rate: 18,000 bph Introduced: 1937
Updated Bubble Back movement. Successor to the 620 with refinements to the rotor and winding mechanism. Used across the full range of late-1930s through 1940s Bubble Back references.
Models: Oyster Perpetual Bubble Back — Ref. 2764, 2940, 3065, 3131, 3133, 3372, 3599, 3772, 5050
Type: Automatic, no date Beat Rate: 18,000 bph Introduced: 1950
Transitional automatic movement bridging the Bubble Back era and the modern OP family. Used in early 1950s Oyster Perpetual references.
Models: Oyster Perpetual — early 1950s references
Type: Automatic, no date Beat Rate: 18,000 bph Introduced: 1950
Automatic movement used in early Oyster Perpetual references of the 1950s. Contemporary of the 635.
Models: Oyster Perpetual — Ref. 6085
Type: Automatic, no date Beat Rate: 18,000 bph Introduced: 1940
Automatic movement used in early Oyster Perpetual references. Shares the same era as the 620/630 Bubble Back family but used in distinct case references.
Models: Oyster Perpetual — Ref. 4134
Type: Automatic, no date Beat Rate: 18,000 bph Introduced: 1945
Post-war automatic movement. Transitional caliber between the Bubble Back era and the modern OP family of the early 1950s.
Models: Oyster Perpetual — post-war references
Type: Automatic w/ date Beat Rate: 18,000 bph Introduced: 1945
Date variant of the 730 family. One of Rolex's earliest automatic movements with a date complication. Post-war era.
Models: Oyster Perpetual Date — post-war references
Type: Automatic w/ date Beat Rate: 18,000 bph Introduced: 1952
Automatic date movement from the early 1950s. Used in early Datejust-era references before the 1000-series movements took over.
Models: Oyster Perpetual Date — Ref. 6039
Type: Automatic w/ date Beat Rate: 18,000 bph Introduced: 1950
Automatic date movement. Part of the transitional family between the Bubble Back era and the modern 1000-series calibers.
Models: Oyster Perpetual Date — early 1950s references
Type: Automatic, no date Beat Rate: 18,000 bph Introduced: 1950
No-date automatic from the early 1950s transitional period. Predecessor to the 1030 family.
Models: Oyster Perpetual — early 1950s references
Type: Automatic, triple calendar w/ moon phase Jewels: 18 Diameter: 29.5mm Beat Rate: 18,000 bph Introduced: ~1950
One of Rolex's most complex vintage automatic movements. Features a triple calendar (day, date, month), moon-phase display, and sweep seconds — all driven by a Perpetual bidirectional rotor. The day and date display in separate apertures; the moon-phase tracks the lunar cycle visually. Built-in shock protection for the balance staff and escapement. Uncommon complexity for a mid-20th century Rolex movement and highly sought by collectors.
Models: Triple Calendar — Ref. 6062
Automatic 1000 Series
Rolex Cal. 1030 Automatic Movement — 1000 Series — Shop Automatic Watches
Type: Automatic (experimental) Beat Rate: 18,000 bph Introduced: ~1960
Extremely rare prototype/experimental movement developed for the Deep Sea Special — Rolex's experimental dive watch tested at the bottom of the Mariana Trench in 1960 alongside the Trieste bathyscaphe. Not a production caliber; represents the outer limits of Rolex engineering at the time.
Models: Deep Sea Special (experimental)
Type: Automatic, no date Jewels: 25 Beat Rate: 18,000 bph Introduced: 1950 COSC: Yes
Landmark movement — one of Rolex's first fully in-house automatic calibers with a bidirectional Perpetual rotor. Introduced the modern Rolex movement architecture that all subsequent calibers would build upon. COSC certified chronometer. Used in early Submariner, Explorer, and Oyster Perpetual references through the 1950s.
Models: Oyster Perpetual, Explorer, Submariner — Ref. 6500, 6502, 6532, 6536, 6538, 6540, 6552, 6564–6599, 6610, 6614, 6634
Type: Automatic w/ date Jewels: 25 Beat Rate: 18,000 bph Introduced: 1957
Date variant of the 1030 family. Used in early Oyster Perpetual Date references of the late 1950s.
Models: Oyster Perpetual Date — Ref. 6518, 6530, 6534
Type: Automatic w/ date, GMT Jewels: 25 Beat Rate: 18,000 bph Introduced: 1957
Date and 24-hour GMT hand variant of the 1030 family. Used in early GMT and Oyster Perpetual Date references of the late 1950s.
Models: Oyster Perpetual Date, GMT — Ref. 6534, 6535, 6537, 6542, 6646
Type: Automatic, dead-seconds (Tru-Beat) Beat Rate: 18,000 bph Introduced: 1954
Extremely rare "Tru-Beat" movement featuring a dead-seconds mechanism — the seconds hand jumps in discrete one-second increments rather than sweeping continuously. Developed for medical and scientific use where precise second-counting was critical. One of the rarest and most collectible Rolex movements.
Models: Rolex Tru-Beat — Ref. 1020, 6556, 6558
Type: Automatic w/ date Beat Rate: 18,000 bph Introduced: 1954
Date movement from the early 1000-series family. Used in Oyster Perpetual Date references of the mid-1950s.
Models: Oyster Perpetual Date — Ref. 6510, 6511, 6611, 6612, 6613
Type: Automatic, no date Beat Rate: 18,000 bph Introduced: ~1955
No-date automatic from the 1000-series family. Used in mid-1950s Oyster Perpetual references.
Models: Oyster Perpetual — mid-1950s references
Type: Automatic w/ date Beat Rate: 18,000 bph Introduced: 1955
Date variant of the 1060. Used in Oyster Perpetual Date references of the mid-to-late 1950s.
Models: Oyster Perpetual Date — Ref. 6602, 6604, 6605, 6609
Type: Automatic w/ date Beat Rate: 18,000 bph Introduced: ~1957
Date variant within the 1060 family. Used in late-1950s Oyster Perpetual Date references.
Models: Oyster Perpetual Date — late 1950s references
Type: Automatic, antimagnetic Beat Rate: 18,000 bph Introduced: 1955
Antimagnetic movement — the first Rolex caliber designed specifically to resist magnetic fields. Predecessor to the Cal. 1580 used in the later Milgauss Ref. 1019. Used in the original Milgauss references of the mid-1950s.
Models: Milgauss — Ref. 6541, 6543
Type: Automatic, no date Beat Rate: 19,800 bph Introduced: 1953
Higher-beat no-date automatic. Used in early 1950s Oyster Perpetual references. Marks the transition toward higher-frequency movements in the 1000-series family.
Models: Oyster Perpetual — Ref. 6503, 6504, 6505, 6506, 6507, 6509, 6515, 6526, 6546
Type: Automatic, no date Beat Rate: 19,800 bph Introduced: 1955
No-date automatic used across a wide range of mid-1950s Oyster Perpetual references. Shares the higher beat rate of the 1120 family.
Models: Oyster Perpetual — Ref. 6508, 6528, 6547–6559, 6615–6623, 6800–6802
Type: Automatic w/ date Beat Rate: 19,800 bph Introduced: 1955
Date variant of the 1130. Used across a wide range of mid-1950s Oyster Perpetual Date references.
Models: Oyster Perpetual Date — Ref. 6513, 6514, 6516–6533, 6624–6639, 6701, 6702
Type: Automatic, no date Beat Rate: 19,800 bph Introduced: 1964
Updated no-date automatic from the mid-1960s. Used in Oyster Perpetual references of the 1960s alongside the 1161 family.
Models: Oyster Perpetual — Ref. 6547, 6555, 6557, 6559, 6571, 6616, 6622, 6800, 6801, 6803
Type: Automatic, no date Beat Rate: 19,800 bph Introduced: 1964
No-date automatic used in a wide range of 1960s Oyster Perpetual references. Contemporary of the 1160.
Models: Oyster Perpetual — Ref. 6544, 6545, 6548, 6549, 6551, 6553, 6554, 6571, 6615, 6617–6623, 6802–6807
Type: Automatic w/ date Beat Rate: 19,800 bph Introduced: 1965
Date variant of the 1160/1161 family. Used in mid-1960s Oyster Perpetual Date references.
Models: Oyster Perpetual Date — Ref. 6513, 6514, 6638, 6700, 6703
Type: Automatic w/ date Beat Rate: 19,800 bph Introduced: 1967
Updated date movement from the late 1960s. Used across a wide range of Oyster Perpetual Date references through the late 1960s and into the 1970s before the 1500-series took over.
Models: Oyster Perpetual Date — Ref. 6516, 6517, 6519–6521, 6524, 6527, 6529, 6531, 6533, 6624, 6625, 6627, 6629, 6631–6633, 6635, 6639, 6660, 6701–6705
Automatic 1500 Series
Rolex Cal. 1520 Automatic Movement — 1500 Series — Shop Vintage Watches
Type: Automatic, no date Jewels: 26 Beat Rate: 19,800 bph Introduced: 1963 COSC: Yes
Base no-date caliber of the 1500 family. COSC certified chronometer. Powered the Air-King and Submariner through the 1960s–70s.
Models: Air-King Ref. 5500, 5501, 5504, 5513, Submariner Ref. 5512, 5513
Type: Automatic w/ date Jewels: 26 Beat Rate: 19,800 bph Introduced: 1965 COSC: Yes
Date variant of the 1520 family. COSC certified chronometer. Used in Air-King Date and Explorer Date references.
Models: Air-King Date, Explorer Date — Ref. 5700, 5701
Type: Automatic, no date Beat Rate: 18,000 bph Introduced: 1957
Earlier no-date automatic from the 1500 family predecessor generation. Used in Air-King and early Submariner references before the 1520 upgrade.
Models: Air-King, Submariner — Ref. 5500, 5501, 5502, 5504, 5505, 5506, 5508, 5510, 5512, 5513, 5516, 5518, 5552, 5590
Type: Automatic w/ date Beat Rate: 18,000 bph Introduced: 1957
Date variant of the 1530. Earlier generation date movement before the higher-beat 1525 replaced it. Used in Air-King Date and Explorer Date.
Models: Air-King Date, Explorer Date — Ref. 5700, 5701
Type: Automatic, Day-Date Beat Rate: 18,000 bph Introduced: 1959
First Day-Date movement in the 1500 family. Day display at 12 o'clock, date at 3 o'clock. Lower beat rate predecessor to the 1556.
Models: Day-Date — Ref. 1802, 1803, 1804, 1805, 1806, 1807, 1808, 1809, 1810, 1811, 1812
Type: Automatic, Day-Date Beat Rate: 19,800 bph Introduced: 1965
Updated Day-Date movement with higher beat rate. Replaced the 1555 from 1965 onward. Day at 12, date at 3. Used across the full range of 18k Day-Date references through the late 1970s.
Models: Day-Date — Ref. 1802, 1803, 1804, 1806, 1807, 1808, 1809, 1810, 1811, 1812, 1813, 1814, 1815, 1831, 6611
Type: Automatic, no date Jewels: 26 Beat Rate: 18,000 bph Introduced: 1959 COSC: Yes
COSC certified chronometer. Accurate to -4/+6 sec/day over 15-day COSC testing period. Predecessor to the higher-beat 1570.
Models: Submariner, Explorer, GMT-Master — Ref. 1002–1039, 5512
Type: Automatic w/ date, GMT Beat Rate: 18,000 bph Introduced: 1959
Date and 24-hour GMT hand variant of the 1560. Used in early GMT-Master and Oyster Perpetual Date references.
Models: OP Date, GMT-Master — Ref. 1500–1611, 1675
Type: Automatic, no date Jewels: 26 Beat Rate: 19,800 bph Introduced: 1965 COSC: Yes
The legendary workhorse. Known for exceptional robustness and longevity. Powered Datejust and Submariner models throughout the 1960s and 70s. One of the most respected vintage Rolex movements.
Models: OP, Submariner, Explorer — Ref. 1002–1039, 1500, 5512
Type: Automatic w/ date, GMT Jewels: 26 Beat Rate: 19,800 bph Introduced: 1965 COSC: Yes
Successor to the 1570 with hacking (stop-seconds) feature and 24-hour GMT hand. Used in GMT-Master and Submariner Date models. Shares most components with the 1570.
Models: GMT-Master Ref. 1675, Submariner Date, Explorer II, OP Date — Ref. 1500–1680
Type: Automatic, antimagnetic Beat Rate: 19,800 bph Introduced: 1963
Antimagnetic movement used exclusively in the Milgauss Ref. 1019. Features a soft-iron inner case to shield the movement from magnetic fields. Not a GMT variant — this is the dedicated Milgauss caliber.
Models: Milgauss Ref. 1019
Ladies Calibers (2000 Series)
Rolex Cal. 2236 Ladies Automatic Movement — Syloxi Hairspring — Shop Rolex Ladies Watches
Type: Automatic, no date Jewels: 29 Beat Rate: 28,800 bph Power Reserve: ~40 hrs Introduced: 1977
First of the modern 2000-series ladies automatic movements. Introduced with the Lady-Datejust, featuring a bidirectional Perpetual rotor scaled for smaller case diameters. No date complication. Replaced the earlier ladies movements from the 1500 family.
Models: Lady-Datejust, Oyster Perpetual — Ref. 6916, 6917, 6919
Type: Automatic w/ quickset date Jewels: 29 Beat Rate: 28,800 bph Power Reserve: ~40 hrs Introduced: 1979
Date variant of the 2030. Added quickset date function — date adjustable independently without advancing the hands. Used across the Lady-Datejust lineup through the early 1980s before the 2135 took over.
Models: Lady-Datejust — Ref. 6917, 69173, 69174, 69178
Type: Automatic, no date Jewels: 29 Beat Rate: 28,800 bph Power Reserve: ~40 hrs Introduced: 1977
No-date ladies automatic. Contemporary of the 2030, used in Oyster Perpetual ladies references without a date window. Shares the same scaled-down Perpetual rotor architecture as the 2030 family.
Models: Oyster Perpetual — Ref. 6718, 6748, 6749, 76080
Type: Automatic w/ date Jewels: 29 Beat Rate: 28,800 bph Power Reserve: ~40 hrs Introduced: 1987
Updated ladies automatic with date. Successor to the 2035, featuring improved regulation and Microstella adjustable balance wheel. The workhorse of the Lady-Datejust lineup for nearly two decades. Replaced by the 2235 and later 2236.
Models: Lady-Datejust, Datejust 31 — Ref. 68274, 69173, 69174, 69178, 69179, 79173, 79174, 79178
Type: Automatic, no date Jewels: 31 Beat Rate: 28,800 bph Power Reserve: ~48 hrs Introduced: ~2012
No-date ladies automatic based on the 3130 architecture, scaled to a smaller diameter for mid-size cases. Features Parachrom Blue hairspring and Paraflex shock absorber. Used in Oyster Perpetual 31 and 34 references.
Models: Oyster Perpetual 31, Oyster Perpetual 34 — Ref. 177200, 177234
Type: Automatic w/ date Jewels: 31 Beat Rate: 28,800 bph Power Reserve: ~48 hrs Introduced: ~2012
Date variant of the 2230. Based on the 3135 architecture scaled for mid-size cases. Features Parachrom Blue hairspring. Used in Lady-Datejust and Datejust 31 references of the 2010s before the 2236 took over.
Models: Lady-Datejust, Datejust 31 — Ref. 178240, 178241, 178243, 178274
Type: Automatic, no date Jewels: 31 Beat Rate: 28,800 bph Power Reserve: ~55 hrs Introduced: 2015
No-date ladies automatic featuring the Syloxi hairspring — Rolex's silicon-based hairspring insensitive to magnetic fields and 10x more shock-resistant than conventional hairsprings. Superlative Chronometer certified. Used in Oyster Perpetual 31 references from 2015 onward.
Models: Oyster Perpetual 31 — Ref. 277200
Type: Automatic w/ date Jewels: 31 Beat Rate: 28,800 bph Power Reserve: ~48 hrs Introduced: 2000
Updated ladies automatic with date. Successor to the 2135, incorporating Parachrom Blue hairspring for improved magnetic resistance and shock protection. Used across the Lady-Datejust and Datejust 31 lineup through the 2000s and early 2010s before the 2236 replaced it.
Models: Lady-Datejust, Datejust 31 — Ref. 179160, 179161, 179163, 179164, 179165, 179166, 179168, 179169, 179171, 179174, 179175, 179176, 179178, 179179
Type: Automatic w/ date Jewels: 31 Beat Rate: 28,800 bph Power Reserve: ~55 hrs Accuracy: -2/+2 sec/day Introduced: 2015
Current-generation ladies automatic with date. Features the Syloxi hairspring — Rolex's silicon-based hairspring insensitive to magnetic fields and 10x more shock-resistant than conventional hairsprings. Extended 55-hour power reserve over the 2235. Superlative Chronometer certified. The definitive modern ladies Rolex movement.
Models: Lady-Datejust 28, Datejust 31, Oyster Perpetual 31 — Ref. 279160, 279161, 279163, 279164, 279165, 279166, 279168, 279169, 279171, 279174, 279175, 279176, 279178, 279179
3000 Series Transitional Calibers
Rolex Cal. 3035 Automatic Movement — First High-Beat Quickset Date — Shop Rolex Watches
Type: Automatic, no date Jewels: 27 Beat Rate: 28,800 bph Introduced: 1990 COSC: Yes
Time-only, no-date high-beat transitional movement bridging the 1500 and 3035 families. Used in no-date Air-King, Submariner, and Explorer references through the 1990s.
Models: Air-King, Submariner, Explorer — Ref. 14000, 14010, 14060, 14270
Type: Automatic w/ quickset date Jewels: 27 Beat Rate: 28,800 bph Introduced: 1977 COSC: Yes
The first men's high-beat caliber Rolex ever made. Increased balance speed from 19,800 to 28,800 bph. The first automatic caliber with quickset date. Introduced the Microstella regulation system. A pivotal movement in Rolex history.
Models: Datejust, Submariner Date, Sea-Dweller — Ref. 15000, 16000, 16600, 16660, 16800
Type: Automatic, Day-Date Jewels: 27 Beat Rate: 28,800 bph Introduced: 1977 COSC: Yes
Day-Date complication based on the 3035. Day of the week at 12, date at 3. Used across the full 18k Day-Date lineup through the mid-1980s.
Models: Day-Date — Ref. 18026, 18028, 18029, 18038, 18039, 18046, 18048, 18049, 18078, 18079
Type: Automatic, GMT w/ date Jewels: 27 Beat Rate: 28,800 bph Introduced: 1979
GMT movement with independently adjustable 24-hour hand and quickset date. Used in the GMT-Master "Fat Lady" references. Predecessor to the 3085.
Models: GMT-Master Ref. 16750, 16753, 16758
Type: Automatic, GMT w/ date Jewels: 27 Beat Rate: 28,800 bph Introduced: 1985
Updated GMT movement with independently adjustable 24-hour hand and quickset date. Successor to the 3075. Used in the GMT-Master II and late Explorer II references.
Models: GMT-Master II, Explorer II — Ref. 16550, 16760
31xx Series — The Modern Foundation
Rolex Cal. 3186 GMT Movement — 31xx Series — Shop Rolex Watches
Type: Automatic, no date Jewels: 31 Beat Rate: 28,800 bph Power Reserve: ~48 hrs Introduced: 1988 COSC: Yes
No-date version of the 3135 platform. Shares the same architecture, Microstella regulation, and Kif/Paraflex shock absorber but omits the date mechanism for a cleaner dial. Used in no-date Submariner, Explorer I, and Air-King references for over 30 years.
Models: Submariner (no date) Ref. 14060, 14060M, Explorer I Ref. 114270, Air-King Ref. 114200
Type: Automatic, no date, antimagnetic Jewels: 31 Beat Rate: 28,800 bph Power Reserve: ~48 hrs Introduced: 2007 COSC: Yes
Antimagnetic variant of the 3130. Features a Parachrom Blue hairspring and a soft-iron inner shield surrounding the movement to protect against magnetic fields up to 1,000 gauss. Developed exclusively for the revived Milgauss Ref. 116400 launched in 2007.
Models: Milgauss Ref. 116400, 116400GV
Type: Automatic, no date Jewels: 31 Beat Rate: 28,800 bph Power Reserve: ~48 hrs Introduced: 2010 COSC: Yes
Updated no-date variant of the 3130 incorporating the Paraflex shock absorber system — Rolex's proprietary shock protection offering 50% better protection than conventional systems. Also features the Parachrom Blue hairspring. Used exclusively in the Explorer I Ref. 214270.
Models: Explorer I Ref. 214270 (2010–2021)
Type: Automatic w/ date Jewels: 31 Beat Rate: 28,800 bph Power Reserve: ~48 hrs Diameter: 28.5mm Introduced: 1988 COSC: Yes
The most iconic modern Rolex movement. Served as the backbone of the entire Rolex lineup for over 30 years (1988–2020). Features instantaneous date change at midnight, Microstella adjustable-inertia balance wheel, and Kif shock absorber (later upgraded to Paraflex). Parachrom Blue hairspring added from ~2005. The foundation for the 3155 (Day-Date), 3130 (no date), 3131 (antimagnetic), and 3185/3186 (GMT) derivative calibers.
Models: Datejust 36/41, Submariner Date Ref. 16610, 116610, Sea-Dweller Ref. 16600, 116600, Yacht-Master Ref. 16622, 116621, Datejust II Ref. 116300
Type: Automatic, Day-Date Jewels: 31 Beat Rate: 28,800 bph Power Reserve: ~48 hrs Introduced: 1988 COSC: Yes
Day-Date complication based on the 3135 platform. Day of the week displayed at 12 o'clock in a full-word aperture (available in 26 languages), date at 3 o'clock. Used across the full 18k Day-Date 36 and Day-Date II lineup from 1988 through 2015 when the 3255 took over.
Models: Day-Date 36 Ref. 18038, 18039, 18206, 18209, 18238, 18239, 18346, Day-Date II Ref. 218206, 218238, 218239
Type: Automatic, Day-Date w/ Paraflex Jewels: 31 Beat Rate: 28,800 bph Power Reserve: ~48 hrs Introduced: 2008 COSC: Yes
Updated Day-Date movement incorporating the Paraflex shock absorber system for enhanced protection. Transitional caliber used in early Day-Date 40 production before the 3255 replaced it in 2015. Retains the full Day-Date complication — day at 12, date at 3.
Models: Day-Date 40 Ref. 228238, 228235 (early production, 2008–2015)
Type: Automatic, GMT w/ date Jewels: 31 Beat Rate: 28,800 bph Power Reserve: ~48 hrs Introduced: 1989
GMT variant of the 3135 with independently adjustable 24-hour hand and quickset date. Transitional caliber used in early GMT-Master II production before the 3185 became the standard. Distinguishable from the 3185 by minor rotor and bridge differences.
Models: GMT-Master II Ref. 16710 (early production, 1989–1991)
Type: Automatic, GMT w/ date Jewels: 31 Beat Rate: 28,800 bph Power Reserve: ~48 hrs Introduced: 1985
GMT movement based on the 3035 architecture with independently adjustable 24-hour hand and quickset date. Used exclusively in the Explorer II Ref. 16550 — the first Explorer II offered with a choice of white or black dial. Notable for powering the rare "cream dial" variant. Predecessor to the 3185 in the Explorer II lineage.
Models: Explorer II Ref. 16550 (1985–1989)
Type: Automatic, GMT w/ date Jewels: 31 Beat Rate: 28,800 bph Power Reserve: ~48 hrs Introduced: ~1990
GMT variant closely related to the 3185, used in specific GMT-Master II production runs of the early 1990s. Features independently adjustable 24-hour hand and quickset date. Considered a transitional variant between the 3165 and 3185 — differences are primarily internal to the rotor and winding mechanism.
Models: GMT-Master II Ref. 16710 (early 1990s variant)
Type: Automatic, GMT w/ date Jewels: 31 Beat Rate: 28,800 bph Power Reserve: ~48 hrs Introduced: 1991 COSC: Yes
Standard GMT movement of the 31xx generation. Based on the 3135 architecture with an independently adjustable 24-hour GMT hand and quickset date. The primary GMT-Master II caliber from 1991 through 2005 when the 3186 with Parachrom hairspring replaced it.
Models: GMT-Master II Ref. 16710 (1991–2005)
Type: Automatic, GMT w/ date Jewels: 31 Beat Rate: 28,800 bph Power Reserve: ~48 hrs Introduced: 2005 COSC: Yes
Updated GMT movement featuring the Parachrom Blue hairspring for improved magnetic resistance and shock protection. Debuted with the ceramic-bezel GMT-Master II Ref. 116710. Used from 2005 through 2018 when the 3285 (32xx generation) replaced it.
Models: GMT-Master II Ref. 116710LN, 116710BLNR (Batman), 116713LN, 116718LN (2005–2018)
Type: Automatic, GMT w/ date Jewels: 31 Beat Rate: 28,800 bph Power Reserve: ~48 hrs Introduced: 2011 COSC: Yes
GMT movement with independently adjustable 24-hour hand and date. Features Parachrom Blue hairspring. Used exclusively in the Explorer II Ref. 216570 — the last Explorer II before the transition to the 32xx generation in 2021. The 24-hour hand on the Explorer II is fixed (not independently adjustable) and used to distinguish AM from PM.
Models: Explorer II Ref. 216570 (2011–2021)
Type: Automatic, GMT w/ date Jewels: 31 Beat Rate: 28,800 bph Power Reserve: ~48 hrs Introduced: ~1989
GMT variant of the 3135 family used in specific Oyster Perpetual Date GMT references of the late 1980s and early 1990s. Features independently adjustable 24-hour hand and quickset date. Closely related to the 3185 but used in non-GMT-Master II references. Rarely documented separately from the broader 31xx GMT family.
Models: Oyster Perpetual Date GMT — late 1980s–early 1990s references
32xx Series — Current Generation
Rolex Cal. 3255 Movement — 32xx Current Generation — Chronergy Escapement — Shop Rolex Watches
Type: Automatic, no date Jewels: 31 Beat Rate: 28,800 bph Power Reserve: ~70 hrs Diameter: 28.5mm Accuracy: -2/+2 sec/day Introduced: 2020
Time-only, no-date movement of the new generation. Features Chronergy escapement (15% more efficient), Parachrom Blue hairspring with Rolex overcoil, Paraflex shock absorber, and bi-directional Perpetual rotor. 14 patents filed. Superlative Chronometer certified.
Models: Submariner 41 (Ref. 124060), Air-King 40 (Ref. 126900), Oyster Perpetual 36/41, Explorer 40, Deepsea Challenge
Type: Automatic w/ date Jewels: 31 Beat Rate: 28,800 bph Power Reserve: ~70 hrs Diameter: 28.5mm Accuracy: -2/+2 sec/day Introduced: 2015
The successor to the legendary 3135. Rolex's current-generation workhorse with date. Features Chronergy escapement, Parachrom Blue hairspring, 70-hour power reserve (up from 48), and optimized mainspring barrel. Now powers the majority of the Rolex lineup. Superlative Chronometer certified.
Models: Submariner Date 41, Datejust 36/41, Sea-Dweller, Yacht-Master, Sky-Dweller (with 9002), Explorer II, Deepsea
Type: Automatic, Day-Date Jewels: 31 Beat Rate: 28,800 bph Power Reserve: ~70 hrs Accuracy: -2/+2 sec/day Introduced: 2015
Day-Date complication of the 32xx generation. Day at 12 o'clock, date at 3 o'clock. First movement to debut the Chronergy escapement when launched with the Day-Date 40. Superlative Chronometer certified.
Models: Day-Date 40 (Ref. 228238, 228235, etc.)
Type: Automatic, GMT Jewels: 31 Beat Rate: 28,800 bph Power Reserve: ~70 hrs Accuracy: -2/+2 sec/day Introduced: 2018
Current-generation GMT movement with independently adjustable 24-hour hand. Chronergy escapement, Parachrom Blue hairspring. Debuted with the iconic "Pepsi" GMT-Master II on Jubilee bracelet. Superlative Chronometer certified.
Models: GMT-Master II (Ref. 126710), Explorer II (Ref. 226570)
Chronograph Calibers (4xxx)
Rolex Cal. 4130 In-House Chronograph Movement — Cosmograph Daytona — Shop Daytona Chronographs
Type: Automatic chronograph Jewels: 31 Beat Rate: 28,800 bph Introduced: 1988
Based on the Zenith El Primero, significantly modified by Rolex. Frequency reduced from 36,000 to 28,800 bph for improved longevity. The first automatic Daytona movement. Used from 1988 to 2000.
Models: Cosmograph Daytona Ref. 16520
Type: Automatic chronograph Jewels: 44 Beat Rate: 28,800 bph Power Reserve: ~72 hrs Introduced: 2000
Rolex's first fully in-house chronograph movement. Column-wheel design, vertical clutch for smooth chronograph engagement. Fewer parts than the 4030 (290 vs 350+). Parachrom hairspring and Paraflex in later versions. Used from 2000 to 2023.
Models: Cosmograph Daytona Ref. 116500LN, 116503, 116508, 116515LN
Type: Automatic chronograph Beat Rate: 28,800 bph Power Reserve: ~72 hrs Accuracy: -2/+2 sec/day Introduced: 2023
Current Daytona chronograph with Chronergy escapement and all 32xx-generation technologies. Superlative Chronometer certified. Debuted with the redesigned 2023 Daytona.
Models: Cosmograph Daytona Ref. 126500LN (2023+)
Type: Automatic chronograph Introduced: 2023
Exclusive to the Cosmograph Daytona “100 Le Mans” centenary edition. Special commemorative variant of the 4131.
Models: Cosmograph Daytona 100 Le Mans (limited)
Type: Automatic, regatta countdown chronograph Beat Rate: 28,800 bph Introduced: 2007
Rolex's first programmable regatta countdown chronograph movement. Features a programmable countdown timer (1–10 minutes) for sailing race starts, with a mechanical memory ring. Column-wheel chronograph with vertical clutch.
Models: Yacht-Master II Ref. 116680, 116681, 116688, 116689
Type: Automatic, regatta countdown chronograph Beat Rate: 28,800 bph Power Reserve: ~72 hrs Introduced: 2013
Updated Yacht-Master II movement with Chronergy escapement and Parachrom Blue hairspring — bringing 32xx-generation technology to the regatta chronograph. Retains the programmable countdown timer and mechanical memory ring. Superlative Chronometer certified.
Models: Yacht-Master II Ref. 116680, 116681, 116688, 116689
Quartz Calibers (5xxx & 6xxx) — Oysterquartz Era
Rolex Cal. 6620 Quartz Movement — Oysterquartz Era — Shop Rolex Watches
Type: Quartz w/ date Beat Rate: 32,768 Hz
Rolex quartz movement for the Oysterquartz Datejust. Produced 1977–2001. Now highly collectible due to limited production and Rolex's return to mechanical-only production.
Models: Oysterquartz Datejust Ref. 17000, 17013, 17014
Type: Quartz w/ day-date Beat Rate: 32,768 Hz
Quartz movement with day and date for the Oysterquartz Day-Date. Features quickset day and date.
Models: Oysterquartz Day-Date Ref. 19018, 19019
Type: Quartz, thermo-compensated
Advanced thermo-compensated quartz with enhanced accuracy. Extremely rare.
Type: Quartz, thermo-compensated, day-date
Thermo-compensated quartz with day-date. Among the most accurate Rolex movements ever produced.
Specialty & Complication Calibers (7xxx & 9xxx)
Rolex Cal. 9001 Sky-Dweller Movement — Annual Calendar & Dual Time Zone — Shop Rolex Sky-Dweller
Type: Automatic, 3-hand w/ date
Automatic 3-hand movement with date display. Part of the new 7xxx family for the 1908 line.
Models: Rolex 1908 (Ref. 52508, 52509)
Type: Automatic, small seconds at 6 Introduced: 2023
Features a small seconds sub-dial at 6 o'clock — a first for modern Rolex. Equipped with the Syloxi hairspring (silicon-based). Powers the dressy 1908 line. Superlative Chronometer certified.
Models: Rolex 1908 39mm
Type: Automatic, dual time zone, annual calendar Jewels: 40 Beat Rate: 28,800 bph Power Reserve: ~72 hrs Introduced: 2012
Rolex's most complicated movement. Features dual time zones (home and local) and an annual calendar using the innovative Saros system — named after the astronomical cycle. The annual calendar automatically distinguishes between 30 and 31-day months; only requires manual correction once a year (at the end of February). 14 patents filed.
Models: Sky-Dweller (Ref. 326934, 326935, 326938)
Type: Automatic, dual time zone, annual calendar Beat Rate: 28,800 bph Power Reserve: ~72 hrs Accuracy: -2/+2 sec/day
Updated Sky-Dweller movement with Chronergy escapement and all 32xx-generation improvements. Superlative Chronometer certified. Current production.
Models: Sky-Dweller (current production)
Authentication & Buyer Guide
Verifying Movement Authenticity
When purchasing a pre-owned Rolex, verifying the movement is one of the most critical steps in authentication. Here is what to look for:
- Correct caliber for the reference — Every Rolex reference number is paired with a specific caliber. A Submariner Date Ref. 116610 must contain a Cal. 3135; a Ref. 126610 must contain a Cal. 3235. Any mismatch is a red flag.
- Matching serial numbers — The serial engraved on the movement should match the case serial (visible between the lugs at 6 o'clock on older models, or on the rehaut post-2005).
- Correct jewel count — Cross-reference the jewel count with the caliber specification. A Cal. 3135 should have 31 jewels; a Cal. 4130 should have 44 jewels.
- Rotor and bridge finishing — Genuine Rolex movements have a distinctive, clean industrial finish with consistent machining. The Perpetual rotor should be clearly engraved with "ROLEX" and relevant text.
- Correct beat rate — A timing machine test should confirm the movement beats at the specification rate (28,800 bph for modern calibers). Deviation suggests a non-genuine or modified movement.
- Parachrom Blue hairspring — Modern Rolex calibers (post-~2005) feature a distinctive blue-colored Parachrom hairspring. Its absence in a watch claimed to have a modern movement is a concern.
Buyer Tips for Pre-Owned Rolex
- Always request a movement photograph or independent inspection before purchasing high-value references.
- Buy from reputable dealers who offer a warranty and authentication guarantee. Browse our authenticated Rolex collection.
- Be wary of "service dial" or "service movement" claims — verify that any replaced components are genuine Rolex parts.
- For vintage pieces, a recent service history from a qualified watchmaker adds significant value and confidence.
- Understand the caliber inside your watch — it directly affects service cost, parts availability, and long-term value.
Model Cross-Reference: Which Caliber Powers Your Rolex?
Current Production Models
- Submariner (no date) — Cal. 3230
- Submariner Date — Cal. 3235
- GMT-Master II — Cal. 3285
- Datejust 36 / 41 — Cal. 3235
- Day-Date 40 — Cal. 3255
- Cosmograph Daytona — Cal. 4131
- Sky-Dweller — Cal. 9002
- Sea-Dweller / Deepsea — Cal. 3235
- Explorer 40 — Cal. 3230
- Explorer II — Cal. 3285
- Yacht-Master 42 — Cal. 3235
- Air-King 40 — Cal. 3230
- Oyster Perpetual 36 / 41 — Cal. 3230
- 1908 39mm — Cal. 7140
- Lady-Datejust 28 / Datejust 31 — Cal. 2236
Classic / Previous Generation
- Submariner Date (pre-2020) — Cal. 3135
- GMT-Master II (2005–2018) — Cal. 3186
- GMT-Master II (1988–2005) — Cal. 3185
- GMT-Master (1985–1988) — Cal. 3085
- GMT-Master (1979–1985) — Cal. 3075
- Explorer II (2011–2021) — Cal. 3187
- Explorer II (1988–2011) — Cal. 3186 / 3185
- Daytona (2000–2023) — Cal. 4130
- Daytona (1988–2000) — Cal. 4030
- Daytona (manual-wind, pre-1988) — Cal. 727 / 722
- Day-Date 40 (2008–2015) — Cal. 3156
- Day-Date (pre-2015) — Cal. 3155 / 3055
- Milgauss — Cal. 3131
- Sky-Dweller (original) — Cal. 9001
- Oysterquartz Datejust — Cal. 5035
- Oysterquartz Day-Date — Cal. 5055
- Vintage Submariner/Datejust (1960s–70s) — Cal. 1570 / 1575
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We offer professional vintage watch repair and restoration services — from full movement overhauls and crystal replacements to bracelet restoration and pressure testing. Every service is performed with the same care and precision as our CPO program, using original parts wherever possible.
Learn About Our Repair Service →Frequently Asked Questions
How do I identify the caliber in my Rolex watch?
The caliber number is engraved on the movement, visible when the caseback is removed by a qualified watchmaker. You can also identify it by looking up your Rolex reference number in the model cross-reference above. Official Rolex warranty cards and chronometer certificates also list the caliber.
How often should a Rolex movement be serviced?
Rolex recommends approximately every 10 years for modern 32xx-series calibers. Classic calibers (3135, 3035) should be serviced every 5–7 years, and vintage movements (1570 and earlier) every 3–5 years. See the Service Guide for detailed recommendations.
What is the difference between Rolex Caliber 3135 and 3235?
The Cal. 3235 is the modern successor to the Cal. 3135. Key improvements: 70-hour power reserve (vs 48), Chronergy escapement (15% more efficient), enhanced Parachrom Blue hairspring with Rolex overcoil, and Superlative Chronometer accuracy of -2/+2 sec/day. Both are COSC-certified automatic date movements.
Did Rolex ever make quartz movements?
Yes. Rolex produced quartz calibers (5035, 5055, 5335, 5355, 6620, 6621) for the Oysterquartz line from 1977 to 2001. These are now highly collectible due to limited production and Rolex's return to exclusively mechanical watches.
What is the Rolex Superlative Chronometer certification?
Since 2015, every Rolex carries the Superlative Chronometer designation, guaranteeing accuracy of -2/+2 seconds per day after casing — exceeding COSC standards of -4/+6 sec/day. It covers precision, power reserve, waterproofing, and self-winding efficiency.
Which Rolex caliber is in the Daytona?
Current Daytonas (2023+) use Cal. 4131. Previous generation (2000–2023) used Cal. 4130. Pre-2000 automatic Daytonas used Cal. 4030 (modified Zenith El Primero). Vintage manual-wind Daytonas used Cal. 727 and Cal. 722 (Valjoux-based).
What movement does the Rolex Sky-Dweller use?
The Sky-Dweller uses Cal. 9001 (original) or Cal. 9002 (current). It is Rolex's most complicated movement, featuring dual time zones and an annual calendar using the innovative Saros system.
Are Rolex parts interchangeable between calibers?
Generally, no. Parts within the same family may share compatibility (e.g., many 1570/1575 parts interchange), but cross-family swaps (3135 parts into a 3235) are not possible due to different escapement architectures. Always use genuine, caliber-specific Rolex parts to maintain authenticity and value.
