The Audemars Piguet Royal Oak Perpetual Calendar ref. 26574ST.OO.1220ST.02 is a 41 mm stainless-steel complication that combines the architectural design of the Royal Oak with one of traditional watchmaking’s most important calendar mechanisms. Its blue “Grande Tapisserie” dial organizes the day, date, month, astronomical moon phase and leap-year indications across four subdials, while white-gold applied hour markers and Royal Oak hands preserve the collection’s familiar visual language. The case measures 9.5 mm thick and is paired with an integrated stainless-steel bracelet.
Inside is Audemars Piguet’s selfwinding calibre 5134, a slim perpetual-calendar movement composed of 374 parts and offering approximately 40 hours of power reserve. The mechanism automatically accounts for differing month lengths and leap years, while the sapphire caseback reveals the movement and its finishing.
Introduced as part of the 2015 generation of the Royal Oak Perpetual Calendar, reference 26574ST.OO.1220ST.02 is especially notable for combining a highly recognizable blue dial with a steel case and bracelet. Its relatively slim profile and full perpetual-calendar display make it a significant reference for buyers seeking both the integrated-sports-watch character of the Royal Oak and a classical high-complication movement.
