In the early 1950s, BMW was mainly known as a manufacturer of efficient, economy cars. Until the 507. With its breathtaking lightness and jawdropping curves, this meteoric roadster broke the mould – and almost broke BMW. Essentially, the 507 was too perfect to be mass-produced. The high-quality materials and bespoke treatment of every car put the price beyond all but a few select admirers like Elvis and Fred Astaire.