1957 Mercedes-Benz 300 SL Roadster
- Engine
- 3.0L SOHC inline-six, 215 bhp (DIN) / 240 hp (SAE)
- Colour
- Dark blue

Chassis 198.042.7500188 is a 1957 Mercedes-Benz 300 SL Roadster, one of the first 618 examples of the open-bodied successor to the legendary Gullwing Coupé. Originally delivered new to Portugal in Ivory over black leather, it was later acquired in the United States by an Italian collector and comprehensively restored in 2006 by specialist Salvatore Diomante at Autocostruzioni SD, emerging in Dark Blue with red leather. The original matching-numbers engine is retained, and the car received a full service at HK Engineering in Germany prior to sale.
Ownership
- —Auction saleEstimate £650,000 – £850,000
- Date unknownFactory deliveryOriginal Portuguese ownerpartial documentation
Car was dispatched new to Portugal in Ivory with black hood and black leather cabin; subsequent history during this period is not documented.
- Date unknownPrivate saleItalian collector of 1950s and 1960s sports carspartial documentation
Acquired the car while it was in the United States; commissioned a full restoration by Salvatore Diomante at Autocostruzioni SD in 2006, refinished in Dark Blue with Red leather.
Competition
No competition history extracted from the catalogue.
Maintenance & restoration
- 2006RestorationAutocostruzioni SD
Comprehensive restoration carried out to a high standard, resulting in a colour change to Dark Blue paintwork with a red leather interior. The original matching-numbers engine was retained throughout.
Work performed by restorer Salvatore Diomante; supporting receipts are held on file.
- —ServiceHK Engineering
Pre-sale preparation including a new water pump, gearbox inspection, and full service.
Carried out at what is described as a leading 300 SL specialist facility based in Germany.
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