The Audemars Piguet Royal Oak Selfwinding Perpetual Calendar Ultra-Thin (Ref. 26586IP.OO.1240IP.01) is a masterpiece of horological engineering, combining a sleek 41mm titanium case with a polished 950 platinum bezel. Its blue satin-brushed dial features a perpetual calendar with day, date, month, leap year, and moon phase indicators, all powered by the ultra-thin Calibre 5133 movement. This timepiece offers a 40-hour power reserve and is water-resistant up to 20 meters, making it both a technical marvel and a stylish accessory.