Audemars Piguet 7138

The caliber 7138 is an automatic movement manufactured in-house by Audemars Piguet. It has a diameter of 29.6 mm, a height of 4.1 mm, and contains 41 jewels, operating at a frequency of 28,800 vibrations per hour with a power reserve of 55 hours. The movement is equipped with automatic bidirectional winding and a quickset date function, and it drives a perpetual calendar complication that includes date, day, month, and moon phase displays. It powers the models 26674, 26494, and 26625.