Vacheron Constantin Patrimony self-winding

The Patrimony self-winding, reference 85515/000R-B644, is a round rose gold case measuring 36.5 mm in diameter with a blue dial and a sapphire crystal. It houses the automatic Vacheron Constantin calibre 2450 Q6/3, offering a 40-hour power reserve and a date display, and carries the Poinçon de Genève, the hallmark introduced by the Republic and Canton of Geneva in 1886. The case back is transparent, allowing view of the movement, and the watch is water resistant to 30 metres.