Audemars Piguet Perpetual Calendar

Audemars Piguet's Royal Oak Perpetual Calendar 26574BC.OO.1220BC.01 has a 41 mm case in white gold. The case measures 9.5 mm thick. A sapphire crystal covers the purple dial, and the case is paired with a white gold bracelet fitted with a folding clasp. Inside is the self-winding Calibre 5134, a perpetual calendar movement tracking date, weekday, month and astronomical moon phase. This reference is issued as a special edition. The perpetual calendar mechanism accounts for leap years without adjustment, a function built into the movement itself. Water resistance is set at 50 metres, adequate for a dress watch of this complexity.