Vacheron Constantin Overseas perpetual calendar ultra-thin skeleton

The Overseas perpetual calendar ultra-thin skeleton, reference 4300V/220R-B547, is a 41.5 mm round case in rose gold with a sapphire crystal and silver dial. It carries the Poinçon de Genève, the Hallmark of Geneva introduced in 1886 by the Republic and Canton of Geneva as a standard for fine watchmaking craftsmanship. The automatic calibre 1120 QP powers a perpetual calendar with date, month, year and moon phase functions, viewable also through a display back. Water resistance is rated to 50 metres.