Audemars Piguet Perpetual Calendar

Audemars Piguet's Perpetual Calendar, reference 26494BC.OO.D350KB.01, comes in an 18-carat white gold case measuring 41 mm across. The blue dial sits under a sapphire crystal and pairs with a self-winding movement, calibre 7138. This perpetual calendar tracks the date, month and weekday, and its moon phase display is adjusted through the crown alone. The mechanism also accounts for leap years, so the calendar needs no manual correction across the full cycle. The blue textured rubber strap has a calfskin lining and closes with an 18-carat white gold three-blade folding clasp. Water resistance is a modest 30 metres, in keeping with a dress watch built for the wrist rather than the water.