Mercedes-Benz C 111A comprehensive, insider history of the C 111, the most famous Mercedes never produced. In March 1969, the news that Daimler Benz was developing a Wankel rotary engine sports car hit like a bomb. Six months later, the C 111, with its fascinating design and brilliant driving performance, was the undisputed star of the Frankfurt International Motor Show. The new super sports car was immediately regarded as a worthy successor to the legendary 300 SL.