1955 Mercedes-Benz 300 SL Gullwing 28 December 2016 1955 Mercedes-Benz 300 SL Gullwing Auction: RM Sotheby’s Arizona 2017 Estimate: $1,350,000 – $1,500,000 NOT SOLD Photo Credit: Theodore W. Pieper ©2016 Courtesy of RM Sotheby’s