Vacheron Constantin

At Montres et Bijoux de Genève 1984, Vacheron Constantin presents a suite of selfwinding wristwatches with perpetual calendar. They show the date, day, month and phases of the moon. A small gear in the movement rotates over 4 years to display February 29th every leap year. Round or sixteen-sided cases, all in platinum. With openworked visible movement or diamond decor. (VACHERON CONSTANTIN)