Uploaded April 2026 | Updated September 2026, 2 weeks ago

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Thomas Zimmermann assembles the Big Pilot Perpetual Calendar ProSet® Le Petit Prince from the ground up - calendar mechanism, hands, dial, and white ceramic case coming together with exacting precision.

Shown here for the first time as a complete watch assembly in an accelerated sequence, the video reveals the full architecture of the ProSet® perpetual calendar: a network of gears and a program wheel that tracks every month and leap year.

Adjustable forward and backward via a single crown, it brings rare ease to serious complexity - down to a moon phase accurate to 1,040 years.

Ref. IW339601

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