Designed to fit perfectly into the dashboard of the Amethyst Droptail, the Les Cabinotiers Armillary Tourbillon combines the best of haute horologies with luxury motor-caring. Vacheron Constantin and Rolls-Royce Unveil A Timepiece For The Motorcar Enthusiast At Heart. Rolls-Royce, VACHERON CONSTANTIN. Watches & Jewellery. Designed to fit perfectly into the dashboard of the Amethyst Droptail, the Les Cabinotiers Armillary Tourbillon combines the best of haute horologies with luxury motor-caring. Vacheron Constantin and Rolls-Royce Unveil A Timepiece For The Motorcar Enthusiast At Heart. Rolls-Royce, VACHERON CONSTANTIN. Watches & Jewellery.