Vacheron Constantin released two unique watches characterized in particular by ruby hour-markers, are equipped with the ultra-thin 1731 minute repeater caliber measuring just 3.90 mm thick. It took four years to solve this complex equation of creating a striking movement combining slimness, a pure sound, pleasing aesthetics, reliability and precision. Various technical choices were made to ensure a clear and harmonious sound. The cases are designed to form a single entity with the movement, in a composition that incorporates such subtle parameters as the circulation of air between the mechanism and the case in order to ensure optimal note propagation. Both Les Cabinotiers Minute Repeater ultra-thin - The dance of stones models are presented in pink gold cases, respectively measuring 41 mm and 39 mm in diameter. The latter is the first ladies' minute repeater watch offered by the Maison in this size. Its bezel is adorned with brilliant-cut diamonds, which also sparkle on the lugs and the crown set with a cabochon.