1939 Mercedes-Benz 540 K Special Roadster at Auction 22 January 2017 A 1939 Mercedes Benz 540 K Special Roadster with coachwork by Sindelfingen sold for $6,600,000 as the top result at the RM Sotheby’s 2017 Arizona classic car auction. Patrick Ernzen © 2017 Courtesy RM Sotheby’s