Among the cars rolling across the block at Broad Arrow Auctions' 2026 Quail sale is a 1957 Mercedes-Benz 300 SL Roadster that stands out for more than just its beauty. Finished in an unusual factory shade of Light Green Metallic over green leather, it is one of only 15 Roadsters ever delivered in this color, making it a fraction of a percent of total production. The estimate sits between $1.5 million and $1.8 million.The 1957 Mercedes-Benz 300 SL Roadster wears its rare factory Light Green Metallic. Photo: Broad Arrow AuctionsAccording to its data card, the car was originally ordered in Paris with U.S.-market equipment, a matching green convertible top, and an optional Becker Mexico radio. It was delivered in late May 1958, perfectly timed for a summer of open-top driving. Research by marque authorities has confirmed both its rare color and its matching-numbers status across the chassis, engine, body, transmission, and major mechanical components.After a four-year restoration by marque specialist Rudi Koniczek, the Roadster has earned honors at concours across the West Coast. Photo: Broad Arrow AuctionsWhat gives this Roadster its real story is the man who first owned it in Europe. The car was acquired by Lloyd Perry "Lucky" Casner, an American airline pilot turned racing driver who founded Casner Motor Racing Division, the team better known as Camoradi USA. Based out of Miami, Casner moved from club racing into team ownership in the late 1950s and built one of the most ambitious American privateer efforts the sport had seen, backed by sponsors and supported quietly by major industry figures.AdvertisementAdvertisementAt its peak, Camoradi fielded Maserati Birdcage prototypes and Chevrolet Corvettes for a remarkable lineup of drivers that included Stirling Moss, Dan Gurney, Carroll Shelby, and Masten Gregory. The team's headline result came with a win at the 1960 Nurburgring 1000 Kms, and it also took a class podium at Le Mans. Casner stayed at the center of it all until he was killed in 1965 while testing a Maserati ahead of Le Mans.A year after Casner's death, the Roadster was bought from his estate in Munich by Colonel Gerald E. Sack, a career U.S. Army officer with a background in microbiology and medical research. The Sack family would keep the car for an extraordinary 41 years. Father and son eventually began taking it apart with plans for a full restoration, but like many ambitious 300 SL projects, the work stalled before it could be finished.The car finally found its way to renowned 300 SL restorer Rudi Koniczek in 2007. At his British Columbia shop, the body was separated from the frame and both were brought back to factory specification. The Roadster was refinished in its original Light Green Metallic, retrimmed in fresh green leather with a matching folding top, and treated to a thorough mechanical rebuild down to the correct color-matched Rudge-style knock-off wheels and the Becker Mexico radio.Color-matched Rudge-style knock-off wheels are among the period-correct details from the restoration. Photo: Broad Arrow AuctionsThe Feldhorns, who now offer the car from their collection, discovered it midway through that four-year restoration and acquired it in 2010. Once completed, the Roadster proved itself on the show field, earning first-in-class honors at events including The Quail, the Gull Wing Group convention, and several major West Coast concours, plus an appearance at the invitation-only Hampton Court Concours of Elegance and a pair of 1,000-mile classic rallies.AdvertisementAdvertisementWith its blue-chip status as a 300 SL, its exceptionally rare original color, its matching-numbers integrity, and a direct link to one of postwar America's most colorful racing figures, this Roadster offers a rare combination of provenance and presentation as it crosses the block at The Quail. See it here.⚡️ Read the full article on MotoriousSign up for the Motorious Newsletter. For the latest news, follow us on Facebook, Twitter, and Instagram.