The visionary C 111-I was created in 1969 as the first of four prototype models built to develop new technologies for use in future Mercedes-Benz production vehicles. Innovative in both form and function, it combined aerodynamic fiberglass bodywork with multiple experimental steering, suspension, and transmission designs. A prototype Wankel engine, designed entirely in-house by Mercedes-Benz engineers, was fitted to the vehicle to gauge feasibility for large-scale production. During testing the C111-I was fitted with multiple different engines, including a diesel unit and a gasoline-powered V-8. 

When the C111-I debuted at the International Motor Show in Frankfurt, Germany, many visitors offered to purchase the visually stunning vehicle off the stand. Mercedes-Benz, however, ultimately chose to retain the prototype for further testing and development. The C 111-I on display was the first fully finished vehicle in the C 111 test series and is currently fitted with its original Wankel engine.