Vacheron Constantin Traditionnelle complete calendar openface

The Traditionnelle complete calendar openface, reference 4020T/000R-B654, is part of Vacheron Constantin's Traditionnelle collection. The 41mm round case is made of rose gold and paired with a grey dial and sapphire crystal, with a display back revealing the movement. It houses the automatic calibre 2460 QCL/2, which drives date, weekday, month, and moon phase indications. The watch bears the Poinçon de Genève, a hallmark introduced by the Republic and Canton of Geneva in 1886 to certify origin and craftsmanship.