Audemars Piguet Selfwinding Perpetual Calendar

Audemars Piguet's Royal Oak Selfwinding Perpetual Calendar 26685XT.OO.1320XT.01 measures 41 mm across in titanium. The case stands 9.9 mm thick and carries a sapphire crystal over an openworked dial. Inside is the self-winding calibre 7139, a new perpetual calendar movement built to be skeletonized so the mechanics stay visible from the front. The perpetual calendar tracks date, month and weekday together with a moon phase display, all correcting automatically for months of varying length. It pairs with a titanium bracelet featuring BMG links, closed with a folding clasp. Water resistance is modest at 20 metres, reflecting the watch's role as a dress piece rather than a tool for the wrist.