Legacy Metrics

1957 Mercedes-Benz 300 SL Roadster

198.042.7500188roadGermany
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

  1. Auction sale
    Estimate £650,000 – £850,000

    RM Sotheby's catalogue lot →

  2. Date unknownFactory delivery
    Original Portuguese owner
    partial documentation

    Car was dispatched new to Portugal in Ivory with black hood and black leather cabin; subsequent history during this period is not documented.

  3. Date unknownPrivate sale
    Italian collector of 1950s and 1960s sports cars
    partial 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

  1. 2006Restoration
    Autocostruzioni 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.

  2. Service
    HK 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.

Are you the owner of this car?

This car's public record is built from its auction and competition history. Register your ownership and privately add your own records to make it a verified Legacy Metrics passport — provenance that backs your car's value at sale and gives your insurer evidence to price against. Roy reviews and verifies every registration personally.

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.