Audemars Piguet Perpetual Calendar Openworked "Cactus Jack"

The Audemars Piguet Royal Oak Perpetual Calendar Openworked "Cactus Jack", reference 26585CM.OO.D301VE.01, has an octagonal 41mm case in brown ceramic with an integrated ceramic bracelet. The case measures 9.9mm thick and is fitted with a glareproofed sapphire crystal. Its openworked dial exposes the skeletonized perpetual calendar movement, calibre 5135, which is self-winding and provides 40 hours of power reserve while displaying hours, minutes, moon phases, and the perpetual calendar. Water resistance is rated to 20 meters.