1937 Mercedes-Benz 540 K Special Edition The 1937 Mercedes-Benz 540 K Special Edition sold by RM Auctions in Monterey for $9,680,000 in 2011. © RM Auctions Home » International » 2011 – Ten Most-Expensive Vintage & Classic Cars Sold at Auction » 1937 Mercedes-Benz 540 K Special Edition