Audemars Piguet Perpetual Calendar

Audemars Piguet Royal Oak Perpetual Calendar, reference 26625BC.ZZ.1223BC.02, has a 41mm case in white gold. The self-winding calibre 7138 drives a perpetual calendar with moon phase, weekday, month and date, and the movement is fully skeletonised. A sapphire crystal and sapphire dial leave the openworked construction visible from the front. This is a special edition, set with diamonds throughout the case and bracelet. The bracelet is white gold, fitted with an AP folding clasp. Black is the base dial colour beneath the openworked bridges. Water resistance sits at 50 metres, modest for a piece built around complication rather than depth.