Vacheron Constantin Overseas perpetual calendar ultra-thin

Vacheron Constantin's Overseas perpetual calendar ultra-thin, reference 4300V/220R-B064, measures 41.5 mm across in rose gold. The case stands just 8.1 mm thick, slim for a full perpetual calendar. Behind the silver dial runs the self-winding calibre 1120 QP/1, carrying the Genevian Seal and a 40-hour power reserve, visible through a sapphire display back. The perpetual calendar tracks weekday, month and date together, while a moon phase disc shows two gold moons against a starry sky. Hands and indices carry luminous treatment for legibility in low light. The watch is fitted on a rose gold bracelet with a folding clasp in the same metal, though the strap system allows swapping to leather or rubber. Water resistance is rated to 50 metres, ample for a piece built around such refined mechanics.