Vacheron Constantin Patrimony moon phase retrograde date

Vacheron Constantin's Patrimony moon phase retrograde date, reference 4010U/000G-H057, is a 42.5 mm case in white gold. The case measures 9.7 mm thick and carries the Hallmark of Geneva, marking this as a limited edition of 270 pieces for the Maison's 270th anniversary. A sapphire crystal covers the silver dial, which is patterned after a Maltese cross and paired with a transparent sapphire caseback. The self-winding calibre 2460 R31L/270 drives the retrograde date and a precision moon phase, and stores 40 hours of power reserve. Central seconds round out the display. The watch is fitted to an alligator leather strap closed with a white gold pin buckle. Vacheron Constantin rates the case to 30 metres.