Audemars Piguet Perpetual Calendar

Audemars Piguet's Royal Oak Perpetual Calendar 26579CS.OO.1225CS.01 measures 41 mm in blue ceramic. The case stands 9.5 mm thick and the blue dial sits under a sapphire crystal. Inside is the self-winding calibre 5134, a perpetual calendar movement that tracks the date, month and weekday alongside a moon phase display. The perpetual calendar mechanism accounts for leap years without manual correction. Bracelet and case are both crafted from the same blue ceramic, finished with a folding clasp in blackened polished steel. This continuity of material across case and bracelet is new for the model. Water resistance is a modest 20 metres, so this is a watch for the wrist rather than the pool.