Audemars Piguet 4401

The Caliber 4401 is Audemars Piguet's first fully in-house integrated chronograph movement, debuting in 2019 with the Code 11.59 collection. It features 367 total components, a column-wheel operated flyback chronograph with vertical clutch, and a free-sprung balance with inertia weights for regulation. The skeletonized 22K gold rotor provides visual access to the chronograph mechanism. Functions include hour counter at 3 o'clock, minute counter at 9 o'clock, constant small seconds at 6 o'clock, and instantaneous jumping date at 4:30. Now also powers the Royal Oak Chronograph 41mm.