Audemars Piguet Perpetual Calendar

Audemars Piguet's Royal Oak Perpetual Calendar, reference 26574ST.OO.1220ST.03, has a 41 mm steel case measuring 9.5 mm thick. The blue dial sits under a sapphire crystal and shows contrasting tones typical of the collection. Inside is the self-winding calibre 5134, an in-house movement that drives the perpetual calendar functions. These include date, weekday and month indications along with a moon phase display, all programmed to track leap years without adjustment. The steel bracelet closes with an AP folding clasp. Water resistance is modest for a watch of this complexity, and the case holds a rating of 50 metres.