Vacheron Constantin Traditionnelle perpetual calendar ultra-thin

The Vacheron Constantin Traditionnelle perpetual calendar ultra-thin, reference 4305T/000G-B948, measures 36.5 mm in white gold. The case is 8.43 mm thick, slim enough to suit the ultra-thin billing. A sapphire crystal covers the blue dial, and the self-winding calibre 1120 QP drives the watch from within, carrying the Hallmark of Geneva. This movement combines a perpetual calendar with moon phase and a four-year calendar display, tracking date, weekday and month together. The sapphire caseback shows the finishing typical of Genevan work. An alligator leather strap closes with a white gold pin buckle. Water resistance stands at 30 metres, modest but standard for a dress watch of this kind.