The Audemars Piguet Royal Oak Perpetual Calendar 26574OR.OO.1220OR.01 is a masterclass in haute horlogerie and iconic design, blending the bold geometry of the Royal Oak with the mechanical artistry of a full perpetual calendar. Crafted entirely in 18k rose gold, including the case, bezel, and integrated bracelet, this 41mm timepiece stands at the pinnacle of the Royal Oak’s complicated offerings. The silver-toned “Grande Tapisserie” dial is both elegant and functional, with subdials at 3, 6, and 9 o’clock displaying the date, moon phase, and day respectively. A fourth subdial at 12 o’clock presents the month and leap year cycle, allowing the perpetual calendar to accurately track time without correction until the year 2100. The week of the year is displayed via a blue central hand and inner chapter ring, making this one of the most comprehensive and legible perpetual calendar layouts in modern watchmaking. Inside beats the ultra-thin Caliber 5134, an in-house automatic movement derived from the legendary Caliber 2120. It is just 4.31mm thick, allowing the watch to maintain a slim profile despite its complexity. The movement is beautifully finished with Côtes de Genève, anglage, and a 22k gold skeletonized rotor engraved with the Audemars Piguet family crest—visible through the sapphire crystal caseback. The integrated rose gold bracelet with AP’s signature brushed finish and polished chamfers ensures a seamless aesthetic and comfortable wear. A folding clasp secures the bracelet while maintaining the watch’s clean lines. With its iconic case shape, intricate mechanical complications, and precious metal execution, the Royal Oak Perpetual Calendar 26574OR is a statement of both legacy and innovation. It is ideal for collectors who seek the prestige of Audemars Piguet’s most iconic model, combined with the intellectual and technical depth of a true grand complication.