1931 Duesenberg Model J Murphy Coupe – $10,340,000
It is, in fact, a doozy… well, a Duesy. When this Murphy-bodied Duesenberg sold in 2004 it fetched $4.5 million. In 2011, it sold for more than twice that, at $10.34 million. Duesenbergs were hand built cars, more revered than any other luxury brand in their day (Rolls Royce, Maybach, Bentley).