Porsche 917 'concept study' revealed

Porsche has revealed a very special 'concept study' as it celebrates 50 years of the 917 – dubbed by the marque as "the most famous racing car of all time". First presented at the 1969 Geneva motor show, the Porsche 917 (below) dominated various motorsport events (including Le Mans and the North American CanAM Series) from the late 1960s through to the mid-70s.