1955 Mercedes-Benz 300 SLR Uhlenhaut Coupé

The 1955 Mercedes-Benz 300 SLR Uhlenhaut Coupé joins a closed, upward-opening-door body to a racing-derived mechanical programme. Only two original prototypes are confirmed by Mercedes-Benz. It is one of the clearest cases where a familiar silhouette can conceal a very different engineering identity from the road-going 300 SL.

History and verified programme identity

The Uhlenhaut name refers to engineer Rudolf Uhlenhaut. The closed 300 SLR was developed in the context of Mercedes-Benz’s mid-1950s racing work. Its later fame also includes the sale of one example on 5 May 2022 at an auction held at the Mercedes-Benz Museum with RM Sotheby’s. Mercedes-Benz reported a price of €135 million. That is a specific historical transaction, not a present valuation for either car, and it does not identify the vehicle in every museum photograph as the sold example.

Engineering and design

The decisive distinction from the 300 SL is mechanical. Mercedes-Benz’s historical account places an inline-eight and desmodromic valve operation under the 300 SLR’s body, linking it to the racing programme rather than to the road 300 SL’s inline-six. Upward-opening doors alone cannot resolve that difference. In engineering terms, the car is an unusually compact meeting point of race-derived systems and enclosed-body development. Explaining the engine architecture is more useful than treating the letters SLR as a more expensive version of an otherwise identical SL. This specification belongs to the documented programme. It should be compared using the original measurement convention and the relevant configuration. A larger number copied from a different engine, market or racing derivative would describe a different car. Likewise, an engine change during restoration does not add another vehicle to the original production run. The distinction matters particularly when a model name appears in both road and competition histories: shared styling or ancestry can coexist with substantially different structures and equipment.

The physical car in the supplied photograph

Mercedes-Benz 300 SLR Uhlenhaut Coupé in the Mercedes-Benz Museum, Stuttgart, with its closed gullwing doors, oval front opening and racing-derived body visible. The individual 2022 sale identity is not inferred from the image.

What makes this version distinct

Two prototypes is the maker’s programme reference. It is not an estimate of how many convincing replicas exist, and it should not expand when an original is restored, changes owner or appears at another event. The photographed car is described at the programme level. Its particular chassis and ownership history would require evidence beyond a visitor photograph.

Collecting and chassis evidence

For either original coupé, the archive should distinguish the permanent chassis record from body configuration, maintenance, test use and public display. Preserve custodial records alongside any auction material. An auction account can document an important transaction without replacing the complete engineering and conservation history. Start with the permanent chassis identity and a dated factory specification, then organise invoices, registration documents and photographs into a chronology. A recent photograph describes present appearance; the original delivery record establishes how the vehicle left its manufacturer. Record replacements and reversible changes without erasing their dates. For a limited edition, retain the allocation paperwork and edition plate together, since a badge alone cannot establish membership. Photographs of body seams, interior fittings and mechanical markings help a specialist understand changes across time. Where a vehicle has been repainted or restored, keep the earlier material alongside the finished appearance. A clearly documented change is more informative than an unsupported claim that every component has remained untouched.

Related Mercedes-Benz designs and meaningful comparisons

The W 194 300 SL explains the earlier development of the SL silhouette. The CLK-GTR Straßenversion offers a later, very different example of racing engineering meeting a road-car brief. Their relationship is useful as a comparison of purpose and structure, not a shared production programme.

Reading the sources

The programme sources and the photograph answer different questions. Manufacturer and custodial records establish the original model, Type, category and published production scope. The creator’s file establishes the pictured subject, setting and image permission. An individual chassis history can then add ownership, competition entries and dated repairs without changing the scope of the original programme. Build references are not survivor counts, and a later specification does not automatically become an additional newly manufactured vehicle. Where primary evidence does not establish a complete fabrication census, that field remains unassigned.

Specifications and rarity evidence

Frequently asked questions

How rare is the 300 SLR Uhlenhaut Coupé?

Mercedes-Benz confirms two original Uhlenhaut Coupé prototypes. They are a closed-body development within the 300 SLR story, separate from W 198 300 SL customer production. No additional cars are inferred from auction, restoration or exhibition appearances.

How is 300 SLR Uhlenhaut Coupé classified?

This is a manufacturer-documented historic development programme. Its original purpose, surviving vehicle history and later restoration are treated separately from ordinary customer road-production allocations.

Which technical details are established for the programme?

The primary record supports programme: Closed-body 300 SLR prototype; engine architecture: Racing-derived inline-eight; original prototype reference: Two, confirmed by Mercedes-Benz. These are programme or explicitly attributed photo references. A particular surviving car’s engine, chassis repairs and competition preparation require its own dated documentation.

Does the photographed appearance establish factory originality?

The caption records a real creator-identified 300 SLR Uhlenhaut Coupé subject and its documented setting. It establishes the illustration’s scope, while original components, restoration work and individual race provenance require chassis-specific evidence. A competition number, current paint or museum display is not used as an originality certificate.

What rarity or archive scope is verified?

Mercedes-Benz confirms two original Uhlenhaut Coupé prototypes. They are a closed-body development within the 300 SLR story, separate from W 198 300 SL customer production. No additional cars are inferred from auction, restoration or exhibition appearances.

Who photographed the supplied image?

Alexander Migl via Wikimedia Commons, under CC BY-SA 4.0. The original file and licence are linked with the image. Retain the creator, source and licence when uploading, exporting or reusing it; local retouching and synthetic enlargement have not been performed.

Related Mercedes-Benz profiles

• 1952 Mercedes-Benz 300 SL Race Car
• 1998 Mercedes-Benz CLK-GTR Straßenversion Coupé

Sources and photo credits

• Mercedes-Benz manufacturer record
• Mercedes-Benz manufacturer record

Photograph: Alexander Migl via Wikimedia Commons original source, CC BY-SA 4.0. Original image or source-provided thumbnail supplied without local cropping, retouching or synthetic enlargement.