1955 Mercedes-Benz 300 SL Gullwing W198 Sportabteilung competition
- 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
- —Auction saleEstimate US$5,000,000 – US$7,000,000
- 1955-08-27 → 1956-09-14Factory deliveryMercedes-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.
- 1956-09-14 →Private saleBernard Hans Hommelfull 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.
- → 1966Acquisition unknownMercedes 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.
- 1966 → 2008Private saleFather of the current ownerpartial 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.
- 2008 →InheritanceCurrent 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.
- Date unknownAcquisition unknownMr. Besniespartial documentation
Acquired the car sometime in the late 1950s and kept it largely without repairs or restoration work.
- Date unknownAcquisition unknownGeorges Houelpartial 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
- 19561956 Coupes du SalonDriver: Georges Houel3rd
- 1956Rallye d'AutomneDriver: Georges Houel5th
- 1956Tour de CorseDriver: Georges Houel5th
Event referred to informally as the '10,000 Corners' rally.
- 1956-09-17Tour de France Auto1956 Tour de France AutoDriver: 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.
- 195712 Hours of ReimsDriver: Georges HouelRetired early
- 19576 Hours of Saint-CloudDriver: Georges HouelRetired early
- 1957Andorra-Monaco RallyDriver: Georges HouelDNF
Retirement caused by a tyre failure.
- 1957Sestriere RallyDriver: Georges Houel
Contested in Italy; no result recorded in the source.
Maintenance & restoration
- 1955ModificationMercedes-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.
- 1956RepairAnonymous 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.
- 1967Restoration
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.
- 2008Restoration
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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