The Audemars Piguet Royal Oak Perpetual Calendar (Ref. 26579CE.OO.1225CE.01) is a sophisticated timepiece crafted from hand-finished black ceramic. It features a slate grey dial with the signature "Grande Tapisserie" pattern, displaying day, date, month, astronomical moon phase, and week of the year. The watch is powered by the self-winding Caliber 5134 movement, offering a 40-hour power reserve. The 41mm case is complemented by a black ceramic bracelet, secured with a titanium folding clasp. Water-resistant up to 20 meters, this model combines elegance with technical prowess.