Mercedes-Benz 300SLR Uhlenhaut-Coupe (1955) 310PS, 290km/h; Mercedes produced only two prototypes (one with blue and one with red leather). One was a testcar for the Formula-1 in Sizilia (Italy), and the other one the private car of Rudolph Uhlenhaut, manager of the Mercedes-Benz Formula-1 racing team. This car is 100% unsellable. The Scheich of arabia want to sell it but no chance, this car is only to see in the Mercedes museum (Mercedes-Autostadt), or on legandery rallies like "Mille Miglia" or the "Ennstal-Classic".

Rudolf Uhlenhaut (1906-1989), head of both passenger-car testing and race-car development at Mercedes-Benz at the time, proceeded to build a road version of this formidable race car. The 300SLR coupe – better known to car enthusiasts as the “Uhlenhaut Coupe” – first appeared on the roads in 1955.

The 300SLR coupe incorporated the design of the 300SL Gullwing with the technology of the 300SLR race car. Its long hood was complemented by side-mounted exhaust pipes, dramatic air vents and wire-spoke wheels. The cockpit, with its wraparound windshield, was elegantly sculptured. Uhlenhaut referred to his latest automotive work of art as a “hot-heeled touring car,” and the 300SLR coupe lived up to its billing. Weighing only 2,457 pounds, yet developing 310 horsepower, the “Uhlenhaut Coupe” reached 180 miles per hour during testing, making the two-seater the fastest car of its time to be registered on public roads. However, the lightning-fast SLR coupe never made it into series production. The Stuttgart-based car maker felt that the mid-1950s was not the right time to bring out such a powerful sports car. As Mercedes pulled out of motorsport in 1955, the SLR coupe project was put on ice. Only two prototypes of this masterpiece of power and elegance were ever built.