Vacheron Constantin Patrimony moon phase retrograde date

The Vacheron Constantin Patrimony moon phase retrograde date, reference 4010U/000G-B330, is a 42.5mm round white gold watch with a white dial and sapphire crystal. It is powered by the automatic calibre 2460 R31L, offering 40 hours of power reserve and displaying moon phase and retrograde date functions. The piece bears the Poinçon de Genève, a hallmark introduced by the Republic and Canton of Geneva in 1886 to certify watchmaking quality and provenance. Water resistance is rated to 30 metres.