Vacheron Constantin Traditionnelle complete calendar openface

The Vacheron Constantin Traditionnelle complete calendar openface, reference 4020T/000R-B654, has a rose gold case measuring 41 mm across and 11.05 mm thick. The grey openworked dial sits under a sapphire crystal, revealing the self-winding calibre 2460 QCL/2 beneath, finished to the Hallmark of Geneva. The movement carries a 40-hour power reserve and drives a full set of calendar indications: date, day, month and a precision moon phase, alongside central seconds. A sapphire caseback allows a view of the finishing on the plate and bridges. The watch is fitted on a grey alligator leather strap closed by a rose gold pin buckle. At 30 metres, the rating is modest, in keeping with a dress watch built for calendar work rather than diving.