Vacheron Constantin Traditionnelle perpetual calendar retrograde date openface

Vacheron Constantin's Traditionnelle perpetual calendar retrograde date openface, reference 4030T/000P-H054, is a 41 mm platinum case. The case measures 10.94 mm thick and carries the Hallmark of Geneva. Inside is the self-winding calibre 2460 QPR/270, offering 40 hours of power reserve, visible through a sapphire display back. The silver dial is finished with a hand-guillochéd Maltese cross pattern and sits under a sapphire crystal. The perpetual calendar shows month, weekday and moon phase, with a retrograde date hand sweeping the periphery. Issued as a limited edition, it is fitted to an alligator leather strap with a platinum folding clasp. Water resistance is rated to 30 metres.