The Audemars Piguet Royal Oak Perpetual Calendar Ultra-Thin (Ref. 26586TI.OO.1240TI.01) is a limited edition timepiece that seamlessly combines advanced horological complications with a sleek, lightweight design. Encased in titanium, this 41mm watch features a smoked blue dial with black counters and white gold applied hour markers. The self-winding Caliber 5133 movement offers a 40-hour power reserve and includes a perpetual calendar with day, date, astronomical moon, month, leap year, and night and day indications. This model is limited to 200 pieces, making it a rare and exclusive addition to any collection.