Vacheron Constantin Traditionnelle tourbillon perpetual calendar

Vacheron Constantin's Traditionnelle tourbillon perpetual calendar, reference 6300T/000P-H056, measures 42 mm in platinum. The case stands 11.1 mm thick and carries a white dial finished with hand-guilloché work marking the manufacture's 270th anniversary. A sapphire crystal covers the dial, and a sapphire caseback shows the movement. Inside runs the self-winding calibre 2162 QP/270, bearing the Hallmark of Geneva and holding 72 hours of power reserve. The watch combines a perpetual calendar tracking date, weekday and month over a four-year cycle with a tourbillon carrying its own small seconds. It is fitted to an alligator leather strap closed by a folding clasp in platinum. Water resistance stands at 30 metres.