1955 Porsche 550 Spyder

seinfeld porsche auction
  • Estimated value: $5 million - $6 million
  • Sold: $5.3 million

As Porsche's first purpose-built race car, the rare 550 Spyder "ranks among the most desirable sports cars ever built," according to Gooding. Given that most of these cars had a hard-driven life, it's rare to see surviving examples in this sort of condition. (The 550 Spyder is probably best known as the Porsche model in which James Dean died.) This particular car has been driven fewer than 10,500 miles.

First published March 14, 2016: 12:56 PM ET

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