Audemars Piguet Perpetual Calendar

Audemars Piguet's Royal Oak Perpetual Calendar 26598BC.ZZ.1220BC.01 comes in 18-carat white gold and measures 41 mm across. The case houses the self-winding Calibre 5134, an automatic perpetual calendar movement, under a sapphire crystal. The purple dial displays day, date, week, month, leap year and astronomical moon phase. The watch is set with diamonds, part of a special edition within the Royal Oak Perpetual Calendar line paired with this dial colour. A white gold bracelet closes with an AP folding clasp, and two additional rubber straps, in black and purple, come with the watch. The case holds a water resistance rating of 50 metres.