AP 4401

About the Audemars Piguet AP 4401

A column wheel controls the chronograph and a vertical clutch engages it, so the seconds hand starts cleanly and the chronograph can run permanently; the flyback resets and restarts on a single press; and the hands reset to zero together, which Audemars Piguet achieved with a patented arrangement of the hammers. The reserve is 70 hours at 28,800 vph with 40 jewels, and the movement is finished for a display back, with a 22-carat gold rotor. It replaced the modular 3126/3840 and the Piguet-based 2385, so for the first time every Audemars Piguet chronograph runs one architecture.

In the library it sits under 40 Royal Oak Chronograph 41 references, the 26240 of 2021, 30 CODE 11.59 Chronographs and 18 Royal Oak Offshore 43 mm chronographs of 2021. The 41 mm case accounts for 70 references and the 43 mm for 18. Five are limited editions.

The 4302 is the three-hand movement of the same generation, and the glossary defines the chronograph.