Vacheron Constantin Patrimony retrograde day-date

Vacheron Constantin's Patrimony retrograde day-date, reference 4000U/000R-B110, is a 42.5 mm case in rose gold. The case measures 9.7 mm thick and pairs with a white opaline dial under a sapphire crystal. Inside is the self-winding calibre 2460 R31R7/3, carrying the Hallmark of Geneva and offering 40 hours of power reserve. The layout centres on retrograde day and date displays alongside central seconds, a rare combination for a dress watch of this kind. A sapphire caseback shows the finishing on the movement. The watch is fitted to an alligator leather strap closed by a folding clasp in rose gold. Water resistance is modest: the case is rated to 30 metres.