The Tool Desk
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How to compare rarity
A useful rarity claim needs a clear counting unit. A prototype count, a production total for a whole model, and the number built in one body style are not interchangeable. This list includes documented Mercedes-Benz cars and variants for which the available sources provide a meaningful build figure or a specific, well-documented status. It is not ranked: the evidence does not establish a comparable census across all Mercedes-Benz history.
- Prototypes: factory-built experimental cars, not series-production models.
- Model or series totals: counts for the named model across its production run, which may include multiple body styles.
- Variants: a subset of a model, such as a Pullman or homologation edition; its count should not be confused with the larger family total.
1. 300 SLR Uhlenhaut Coupé: two prototypes
Mercedes-Benz says it built two 300 SLR Uhlenhaut Coupés in 1955. They were prototypes developed as closed-body versions for the 1956 season, not production cars, and the model never raced. The car’s rarity is therefore best described as a two-car prototype run—not as a two-unit production model. Mercedes-Benz Group’s 2022 account records the pair and the sale; the Mercedes-Benz Museum’s information says the other original car is displayed at the museum.
On 5 May 2022, one was sold to a private collector at an auction held at the Mercedes-Benz Museum with RM Sotheby’s. Mercedes-Benz reported €135 million; Guinness World Records reported €135.1 million including premium. The figures have different stated bases, so they should not be presented as identical price measures.
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2. 190 E 2.5-16 Evolution II: 502 homologation cars
The Evolution II was a road-going homologation model associated with Mercedes-Benz’s DTM competition effort. Mercedes-Benz Media reports 502 produced, a specific count for this edition rather than the broader 190 E family. That makes it a clearly documented low-volume example, but the count alone does not establish a ranking among every rare Mercedes-Benz. Mercedes-Benz Media’s 2026 account identifies the model and production figure.
3. Mercedes-Benz 600 W 100: 2,677 cars, including 487 Pullmans
Mercedes-Benz reports 2,677 cars in the 600 W 100 line over a 17-year production run. Of those, 487 were Pullman versions. The Pullman count is a subset, not a separate total to add to the 2,677; it also does not establish counts for every Pullman body configuration. Mercedes-Benz Media’s 2023 account gives both figures.
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4. 300 SL Roadster: 1,858 examples
Mercedes-Benz Media reports 1,858 300 SL Roadsters built over seven years. This is the Roadster count, not a combined total for the Coupé and Roadster. The Public Archive records the wider W 198 family across 1954–1963, a timeline that should not be mistaken for the Roadster’s seven-year production period. See the 2023 Mercedes-Benz Media account for the Roadster figure and the Mercedes-Benz Public Archive W 198 record for the family entry.
5. 500 K and 540 K: 761 chassis across two series
Mercedes-Benz gives a combined total of 761 chassis for the 500 K and 540 K series: 342 500 K chassis and 419 540 K chassis. The 500 K series article describes eight body variants and identifies the Special Roadster as a standout. The 761 figure is not a count of Special Roadsters, nor does the 342 total for 500 K establish how many of that body style were made. Mercedes-Benz’s 2024 500 K article provides the series totals and body-variant context; it does not state a Special Roadster-specific production count.
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What these counts do—and do not—show
The two Uhlenhaut Coupés are the clearest case here of an exceptionally small build quantity, but they are prototypes. The Evolution II has a stated homologation-edition total, while the 600 and 300 SL Roadster figures count larger production groups. The 500 K/540 K statistic covers two series together, not an individual body variant. These numbers answer different questions; ordering them into a single “rarest” ranking would imply a comparability the published figures do not provide.
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