Two rare American automotive icons are heading to the auction block as RM Sotheby’s prepares to offer a 1935 Duesenberg Model SJ Speedster and a 1953 Cadillac Le Mans concept car. According to RM Sotheby’s, both vehicles represent pinnacle achievements in pre-war and post-war engineering, each carrying multi-million-dollar estimates and deep historical provenance.
The 1935 Duesenberg Model SJ Speedster Provenance
The 1935 Duesenberg Model SJ Speedster, often recognized by its chassis number and unique Gurney Nutting-inspired bodywork, stands as a high-water mark for American pre-war luxury. According to RM Sotheby’s auction documentation, the supercharged straight-eight engine produces roughly 320 horsepower, enabling a top speed that rivaled contemporary European racing machines. Duesenberg built only 36 SJ models, making this speedster one of the rarest iterations of a marque legendary for outfitting Hollywood stars and industrial titans.
Collector interest in Duesenberg automobiles remains exceptionally high due to coachbuilding craftsmanship that will never be replicated. The vehicle features an extensive documented history tracing back through decades of prominent collections, preserving its matching-numbers chassis, engine, and supercharger. Market analysts note that elite pre-war American classics have retained strong values among international collectors seeking blue-chip automotive assets.
The 1953 Cadillac Le Mans Concept Car Heritage
Sharing the spotlight is the 1953 Cadillac Le Mans, an experimental design study built to gauge public reaction at the General Motors Motorama. According to historical archives maintained by RM Sotheby’s, GM produced just four copies of the fiberglass-bodied roadster, named to honor the brand’s racing ambitions at the 24 Hours of Le Mans. The car showcases a fiberglass body, a wraparound windshield, and a modified 250-horsepower Cadillac V8 engine.
Unlike standard production vehicles of its era, the Le Mans concept introduced styling cues that later influenced the 1954 Cadillac Eldorado and subsequent production models. Surviving examples of the Le Mans concept are fiercely contested whenever they appear on the open market, as they represent the height of 1950s Jet Age styling and American automotive optimism.
Auction Outlook and Market Impact
| Vehicle | Year | Engine Type | Significance |
|---|---|---|---|
| Duesenberg Model SJ Speedster | 1935 | Supercharged Inline-8 | One of 36 supercharged models produced, combining brute performance with bespoke coachwork. |
| Cadillac Le Mans Concept | 1953 | 250-hp V8 | One of four GM Motorama experimental roadsters showcasing fiberglass construction and futuristic styling. |
Both cars will cross the auction stage during RM Sotheby’s upcoming flagship sale. Bidding is expected to draw intense competition from museum curators and private collectors alike, cementing the status of these two machines among the finest automobiles ever manufactured in the United States.
