1955 Mercedes-Benz 300 SLR - Designed by fabled Mercedes-Benz engineer Rudolf Uhlenhaut, the 300 SLR borrowed the best designs from both the 1954 championship-winning W196 R F1 car and the 1952 300 SL sports car, including the 300 SLR’s steel tube frame. The 300 SLR used an engine cast from a high-strength aluminum alloy called silumin, resulting in an assembled weight of just 517 pounds.

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