Audemars Piguet Perpetual Calendar

The Audemars Piguet Royal Oak Perpetual Calendar 26674ST.OO.1320ST.01 has a 41mm octagonal stainless steel case with an integrated steel bracelet. Its blue Grande Tapisserie dial is protected by a glareproofed sapphire crystal and displays hours, minutes, moon phases and a perpetual calendar. The case measures 4.1mm thick and houses the self-winding calibre 7138, which provides 55 hours of power reserve.