The Audemars Piguet Royal Oak Perpetual Calendar Openworked reference 26585CE.OO.1225CE.01 stands as one of the most technically demanding executions of the iconic Royal Oak, distinguished as the first full black ceramic interpretation of AP's flagship perpetual calendar. The 41mm case, measuring 9.9mm thick, is crafted entirely from black ceramic with the signature octagonal bezel and eight hexagonal screws, a glareproofed sapphire crystal, black ceramic caseback, and a screw-locked crown rated to 20 meters of water resistance, with every component including the bezel, crown, pushers, and integrated bracelet hand-finished in alternating polished and satin-brushed surfaces, a process that takes weeks per piece due to ceramic's extreme hardness. The openworked sapphire dial reveals the architecture of the movement beneath, accented by pink gold applied hour markers, Royal Oak hands with luminescent coating, a black inner bezel, and smoked external zones across the four sub-counters displaying the day, date, month with leap year, and astronomical moon phase. Powering this masterpiece is the self-winding in-house Calibre 5135, a perpetual calendar movement composed of 374 components and 38 jewels, beating at 19,800 vph (2.75 Hz) with a 40-hour power reserve and displaying hours, minutes, week indication, day, date, month, leap year, and an astronomical moon. The watch is completed by a fully integrated black ceramic bracelet secured with a titanium AP folding clasp, delivering both bold modern aesthetics and exceptional scratch resistance. A favorite of Travis Scott across both red-carpet appearances and casual streetwear looks, the 26585CE has seen ceramic Royal Oak Perpetual Calendar production wind down, and secondary market demand has held firmly well above original retail.

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