Vacheron Constantin Traditionnelle perpetual calendar ultra-thin

The Traditionnelle perpetual calendar ultra-thin, reference 4305T/000G-B948, is a 36.5mm round white gold model with a blue dial and sapphire crystal. It is fitted with the automatic Vacheron Constantin calibre 1120 QP, which drives a perpetual calendar with date, month, year and moon phase displays, and features a display case back. The movement and case carry the Poinçon de Genève, a hallmark introduced by the Republic and Canton of Geneva in 1886 to certify watchmaking craftsmanship produced in the city.