In response to a request from a client who collects both luxury cars and fine watches, Vacheron Constantin has created a bespoke on-board watch for their Rolls-Royce Amethyst Droptail motor car. Working closely with the British luxury manufacturer’s designers and craftspeople, Vacheron Constantin's teams have crafted the unique Les Cabinotiers Armillary Tourbillon timepiece, housed in a removable and secure holder that fits into the motor car's fascia.