Vacheron Constantin Traditionnelle Perpetual Calendar Retrograde Date Openface

The Traditionnelle Perpetual Calendar Retrograde Date Openface model features a new self-winding manufacture movement, Calibre 2460 QPR31/270, equipped with two complications. The first is a perpetual calendar displaying the days, months and leap-year cycle, requiring no correction until 2100. These indications are complemented by the moon phases in an aperture at 6 o'clock, accurately tracking the moon's actual cycle of 29 days, 12 hours and 45 minutes. This precision moon-phase display with its realistically designed lunar surface will need just one correction every 122 years. The second complication is a retrograde date display in the upper part of the dial. The openworked dial reveals the mechanism’s beauty and technical sophistication. To enhance the airy appearance of the calibre while ensuring the legibility of the time indications, the sapphire discs with the day, month and leap-year markings are set against a deep blue background. This slim new manufacture calibre is just 5.45 mm thick.