AP 7139

The Calibre 7139 is an automatic perpetual calendar movement from Audemars Piguet measuring 29.6 mm by 4.1 mm, containing 423 parts and 41 jewels. Operating at 4 Hz with a 55-hour power reserve, it displays hours, minutes, and a full calendar—including week and astronomical moon phase—programmed to account for leap years until 2100. Designed for skeletonized applications, the movement allows clear visibility of its gear train and regulating organ through openworked dials.