4. 1962 Shelby Cobra 260 – $13,750,000 (RM Sotheby’s)
This was the first Cobra prototype built by legendary auto designer Carroll Shelby and it marks his first venture into the U.S. auto market. Originally an A.C. Ace sports car in the U.K., Shelby fit a Ford engine into the vehicle, laying the groundwork for the his iconic, high-performance variants of Ford’s Mustang sports car. This sale represents a record auction price for an American car. 