Vacheron Constantin Traditionnelle perpetual calendar retrograde date openface

The Traditionnelle perpetual calendar retrograde date openface (ref. 4030T/000P-H054) carries the Poinçon de Genève, a hallmark introduced by the Republic and Canton of Geneva in 1886 to certify fine watchmaking quality and provenance. The case, 41mm in round platinum, houses a silver dial protected by a sapphire crystal and is water resistant to 30 metres. It is powered by the automatic calibre 2460 QPR31/270, which is skeletonized and visible through a display back, and provides a perpetual calendar with retrograde date and moon phase functions. This reference is issued as a limited edition.