Zenith developed a special complicated watch to celebrate its 150th anniversary, the Georges Favre Jacot timepiece, which is equipped with a fusee and chain constant force system, to its development of marine clocks.
Zenith traces the roots of this watch to its development of marine clocks. The last stages of the assembly of the Academy Georges Favre Jacot watch actually are the fusee and chain. How they are placed into the watch is demonstrated in the following video.
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