Front View of a 1939 Mercedes-Benz 540 K Special Roadster Front view of the 1939 Mercedes-Benz 540 K Special Roadster sold for $4,620,000 in Monterey by RM Auctions. © RM Auctions Home » International » 2011 – Ten Most-Expensive Vintage & Classic Cars Sold at Auction » Front View of a 1939 Mercedes-Benz 540 K Special Roadster