Along with seven other new models that were presented by Cartier at the Salon International de la Haute Horlogerie SIHH 2015 in Geneva, this exceptional complication was also unveiled. The new Rotonde de Cartier Grande Complication Skeleton ref. W1556251 showcases one of the most sophisticated movements in fine watchmaking with a perpetual calendar, a flying tourbillon and a minute repeater all housed in a generous and elegant 45 mm platinum case. Fitted with a pusher instead of a lever to activate the minute repeater mechanism, the new Rotonde de Cartier Grande Complication Skeleton is definitely one of the watches that takes the central stage at the SIHH this year. The Rotonde de Cartier Grande Complication watch is an incredible feat of watchmaking. 578 components, 5 years of development, 15 weeks of production at the Manufacture, 10 weeks of decorating and finishing and 5 weeks of assembly. The result is measured in millimeters. A thickness of 5.49 mm for a self-winding mechanical movement that brings together three of the most prestigious fine watchmaking complications: a perpetual calendar, a minute repeater and a flying tourbillon. Of all Cartier watchmaking creations, this timepiece is the most complex.