1955 Mercedes-Benz 300 SL Alloy Gullwing 5 January 2022 1955 Mercedes-Benz 300 SL Alloy Gullwing, estimate $7,000,000 – $9,000,000 SOLD for $6,825,000 — a 300 SL Gullwing model record Auction: RM Sotheby’s Arizona / Scottsdale 2022 Karissa Hosek ©2021 Courtesy of RM Sotheby’s