1937 Mercedes-Benz 540K Special Roadster

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  • Sold for: $9.9 million
  • Sold by: RM Sotheby's

The January collector car auctions in Scottsdale, Arizona. have become one of the major auto events of the year in the United States. And this Mercedes-Benz 540K recently became the most expensive car ever sold at those auctions.

The 540K is among the most valuable Mercedes models ever made. Powered by a 180-horsepower supercharged V8, this two-seat model was originally built for an American customer. Today, it has just over 10,000 miles on its odometer.

All the prices in this gallery, as reported by the Hagerty collector car insurance company, include auction fees paid by the buyer, usually 10% of the "hammer price."

First published February 2, 2016: 5:38 PM ET