Legacy Metrics

1955 Mercedes-Benz 300 SL Gullwing W198 Sportabteilung competition

198.040.5500640racingGermany
Engine
3.0L SOHC inline-six with Bosch mechanical fuel injection, ~240 bhp, NSL-specification with revised camshaft
Colour
Silver grey metallic

Chassis 5500640 is a steel-bodied 1955 Mercedes-Benz 300 SL Gullwing (W198) distinguished as the first of four factory-prepared competition cars built by the Mercedes-Benz Sportabteilung. Delivered to the competition department on 27 August 1955, it carries special NSL-specification engine, Rudge knock-off wheels, ventilated drum brakes, and other factory racing equipment. Sold in September 1956, it was co-driven by Stirling Moss in the Tour de France Auto, finishing 2nd overall. The car subsequently competed in numerous French events before passing through private French ownership for decades.

Ownership

  1. Auction sale
    Estimate US$5,000,000 – US$7,000,000

    RM Sotheby's catalogue lot →

  2. 1955-08-27 → 1956-09-14Factory delivery
    Mercedes-Benz Sportabteilung (factory competition department)
    full documentation

    Car delivered directly from chassis completion to the factory racing division, where it was equipped with full competition specification. Retained for 13 months, longer than any of the other three similar factory-prepared cars.

  3. 1956-09-14 →Private sale
    Bernard Hans Hommel
    full documentation

    Purchased the car directly from the factory to finance a racing program for Georges Houel, who drove it back to Paris to contest the Tour de France Auto.

  4. → 1966Acquisition unknown
    Mercedes Archambeaud (division of Mercedes Ch. Delecroix)
    partial documentation

    French Mercedes dealership that held the car and through which the next private owner discovered and purchased it.

  5. 1966 → 2008Private sale
    Father of the current owner
    partial documentation

    A dedicated Gullwing enthusiast who had admired the model since childhood; began a restoration that was never finished, after which the car sat unused for roughly four decades.

  6. 2008 →Inheritance
    Current owner (son of previous owner)
    partial documentation

    Inherited or took over the car from his father and resumed efforts to address the interrupted restoration work.

  7. Date unknownAcquisition unknown
    Mr. Besnies
    partial documentation

    Acquired the car sometime in the late 1950s and kept it largely without repairs or restoration work.

  8. Date unknownAcquisition unknown
    Georges Houel
    partial documentation

    Parisian rugby figure and motorcycle racer who campaigned the car in multiple French events over several years; appears to have had effective custody even though Hommel was the formal purchaser.

Competition

  1. 1956
    1956 Coupes du Salon
    Driver: Georges Houel3rd
  2. 1956
    Rallye d'Automne
    Driver: Georges Houel5th
  3. 1956
    Tour de Corse
    Driver: Georges Houel5th

    Event referred to informally as the '10,000 Corners' rally.

  4. 1956-09-17Tour de France Auto
    1956 Tour de France Auto
    Driver: Stirling Moss2nd overall

    Car entered in the Group B competition class wearing number 149; Moss co-drove with Houel. Early ignition trouble severely hampered performance but Moss recovered strongly in the closing stages to claim second place.

  5. 1957
    12 Hours of Reims
    Driver: Georges HouelRetired early
  6. 1957
    6 Hours of Saint-Cloud
    Driver: Georges HouelRetired early
  7. 1957
    Andorra-Monaco Rally
    Driver: Georges HouelDNF

    Retirement caused by a tyre failure.

  8. 1957
    Sestriere Rally
    Driver: Georges Houel

    Contested in Italy; no result recorded in the source.

Maintenance & restoration

  1. 1955Modification
    Mercedes-Benz Sportabteilung

    Factory Sportabteilung preparation including NSL-spec engine with revised camshaft, Rudge knock-off wheels, competition fuel-injection components, special ventilated drum brakes, enlarged oil tank, lowered suspension, and a dedicated final drive ratio of 3.48:1.

    Work carried out between chassis completion on 17 August 1955 and delivery to the competition department on 27 August 1955.

  2. 1956Repair
    Anonymous garage in Grenoble

    Ignition system fault causing power loss was diagnosed and corrected at a small roadside garage in Grenoble during the Tour de France Auto.

    Repair performed mid-event; Moss had nearly withdrawn from the rally before the fix was made.

  3. 1967
    Restoration

    Owner began disassembly for detailed restoration work after a year of regular use. During disassembly, period handwriting referencing Moss and the 1956 race was found on the underside. Work was abandoned unfinished and the car remained dormant for approximately 40 years.

    Approximate date inferred from acquisition in 1966 and 'a year of regular use' before commencing work.

  4. 2008
    Restoration

    The subsequent owner resumed the incomplete restoration that had been suspended decades earlier.

    Scope and completion status of the resumed work are not fully described in the prose.

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Each chassis record is compiled from public auction archives and links to its source material. Ownership, competition and maintenance entries are extracted from those catalogue listings by an LLM, which can make mistakes — please contact us with any corrections. The summary is Legacy Metrics’ own writing; we do not reproduce catalogue text.

“Full” and “partial” documentation labels indicate how well each entry is corroborated in the underlying sources, not an audit of the car’s physical paperwork. Names of recent or living owners are withheld for privacy.