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Caliber 21

Frédéric Piguet Caliber 21 — Ultra-Flat Swiss Movement Guide - Experts Watches

Caliber 21 / Frédéric Piguet / Movement / Omega / Patek Philippe / Rolex / Swiss Watchmaking / Ultra-Flat Movement / Vacheron Constantin / Vintage Watch Movements / Vintage Watches / Watch Movements

Frédéric Piguet Caliber 21 — Ultra-Flat Swiss Movement Guide

Discover the history and legacy of the Frédéric Piguet Caliber 21 — an ultra-flat 1.73mm hand-wound movement used by Patek Philippe, Rolex, Omega, Piaget, Vacheron Constantin, and more.

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Surprising fact: long before TAG bought Heuer in 1985, Edouard Heuer patented the oscillating pinion in 1887—a small, durable component that made stopwatch chronograph resets cleaner and easier to service—this single invention directly influenced 20th-century motorsport timing and remains in many modern chronographs today.

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Surprising fact: long before TAG bought Heuer in 1985, Edouard Heuer patented the oscillating pin...

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Keep your rotation organized and ready for wherever you go. Clear Plastic Zipper Watch Pouch - Th...

Surprising fact: the first true wristwatch GMT function wasn’t born from airlines but from airline pilots and international businessmen pushing for a simple mechanical way to read two timezones at once—Rolex popularized a separate 24-hour hand with a rotatable bezel for quick reference in the 1950s, but the real leap came when manufacturers started offering independently adjustable hour hands in the 1980s, letting travelers set local time without stopping the seconds—crucial for keeping chronometer accuracy while hopping zones.

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Surprising fact: the first true wristwatch GMT function wasn’t born from airlines but from airlin...