Franck Muller 6850SC.OACProduct Highlights The stainless steel case and the simple, bright silver dial give a clean impression of the 'Tonneau Carbes'. The Tonneau case, which is based on the perfect balance of three curves, was meticulously calculated to ensure that each line maintains perfect equilibrium, finding the point where the axes of the curves converge on a single point on a sphere. The unique three dimensional case with its curved lines is designed to be