Vacheron Constantin Patrimony moon phase retrograde date

The Vacheron Constantin Patrimony moon phase retrograde date, reference 4010U/000R-H117, is a 42.5 mm rose gold watch. The case measures 9.7 mm thick and carries a silver dial finished in a pattern inspired by the Maltese cross to mark the Maison's 270th anniversary. A sapphire crystal covers the dial, and a matching sapphire caseback shows the movement. The self-winding calibre, reference number 2460 R31L slash 270, bears the Hallmark of Geneva and offers 40 hours of power reserve. The retrograde date hand and precision moon phase display sit alongside a central seconds function. This is a limited edition, restricted to 270 pieces. A green alligator leather strap closes with an 18K pink gold pin buckle, and the case is rated water resistant to 30 metres.