Vacheron Constantin Overseas perpetual calendar ultra-thin

The Overseas perpetual calendar ultra-thin, reference 4300V/220R-B509, is fitted with a 41.5mm round rose gold case and a blue dial protected by sapphire crystal. It houses the automatic Vacheron Constantin calibre 1120 QP/1, providing perpetual calendar functions including date, month, year and moon phase display. The movement carries the Poinçon de Genève, a hallmark established by the Republic and Canton of Geneva in 1886 to certify watchmaking craftsmanship and provenance.