The Audemars Piguet Royal Oak Perpetual Calendar (Ref. 26598BC.ZZ.1220BC.01) is a luxurious timepiece featuring an 18K white gold case and bracelet, complemented by a vivid purple Grande Tapisserie dial and a bezel adorned with baguette-cut diamonds. This watch offers a comprehensive perpetual calendar, displaying the day, date, month, leap year, and moon phase, all powered by the self-winding Caliber 5134 movement with a 40-hour power reserve.