Audemars Piguet 7139

The caliber 7139 is an automatic movement manufactured in-house by Audemars Piguet. It measures 29.6 mm in diameter and 4.1 mm in height, contains 41 jewels, and operates at a frequency of 28,800 vibrations per hour with a power reserve of 55 hours. The movement features a sweep seconds hand and a perpetual calendar with date, day, month, and moon phase, and it powers models 26443 and 26685.