Caliber 3120 features a 60 hour power reserve, fast-adjustment date display, and stop or hacking seconds. The movement is hand-assembled in Le Brassus. The bridges are chamfered and polished. The jewel sinks are diamond-polished. The wheels feature chamfered spokes and diamond-polished jewel sinks. Screw rims and slots are chamfered. The hand-crafted decoration includes a mainplate circular-grained on both sides and bridges with Côtes de Genève. The monobloc 22-carat gold oscillating weight bears the Audemars and Piguet family crests and the AP monogram.
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