1955 Mercedes-Benz 300 SL Gullwing 7 October 2021 A 1955 Mercedes-Benz 300 SL Gullwing sold for $1,556,000 to top the results at the Bonhams Audrain Concours Auction 2021 in Newport, Rhode Island. Auction: Bonhams Audarin Concours Sale 2021 in Newport, Rhode Island © Bonhams