Legacy Metrics

1950 Maserati A6GCS 2000 'Monofaro'

2012racingItaly
Engine
1978cc inline-six, SOHC (modified to DOHC), triple carburetors, dry-sump lubrication
Colour
Yellow ('Giallo')

Maserati A6GCS 2000 chassis 2012 is one of approximately eight surviving examples of a limited first-series production run of 14–15 cars built between 1947 and 1950. Ordered by the Automovel Club do Brasil in October 1950 and raced extensively in South America by its first owner, Mario Valentim Dos Santos, the car carries the distinction of possibly housing Maserati's earliest dual-overhead-cam cylinder head, a unique factory modification carried out in 1952. Rediscovered in São Paulo in 1972, the car subsequently passed through several notable owners before receiving a comprehensive restoration and extensive competition use in historic events.

Ownership

  1. Auction sale
  2. 1950 → 1953Factory delivery
    Mario Valentim Dos Santos
    full documentation

    First registered owner, ordered via Automovel Club do Brasil; car was returned to the factory in 1952 for engine modifications and then sent back to him in Brazil.

  3. 1953 →Private sale
    Pinheiro Pires
    partial documentation

    Actively raced the car in South American events through at least 1956; the car's history following late 1957 is unresolved.

  4. 1972 → 1973Private sale
    Colin Crabbe
    partial documentation

    British enthusiast who located the car in a São Paulo yard; period photographs document its condition at the time of discovery, with a modified nose and repainted bodywork.

  5. 1973 → 1977Private sale
    Alan Smith
    partial documentation

    Derby-based owner who undertook only limited restoration work before selling on.

  6. 1977 → 1978Private sale
    Danny Margulies
    partial documentation

    Dealer who held the car briefly before it moved on via an intermediary.

  7. 1978 → 2004Private sale
    Sid Colberg
    full documentation

    San Francisco-based proprietor of Anglo American Auto Investments who conducted a thorough restoration beginning in the UK and later continuing in California, then used the car extensively in vintage competition and rallies.

  8. 2004 →Private sale
    Current consignor
    full documentation

    Respected postwar Italian sports car collector who commissioned a full restoration including engine work, and maintained the car to concours standard over an 18-year ownership period.

Competition

  1. 1951
    Gran Premio di Interlagos
    Driver: Mario Valentim Dos Santos1st in class

    Factory sent an official congratulatory letter to the driver; a copy is retained in the car's documentation file.

  2. 1951-04-01
    Circuito Quinta Boa Vista
    Driver: Mario Valentim Dos Santos2nd

    Local Brazilian circuit event; detailed in a report compiled by researcher Maurício Marx.

  3. 1951-11-01
    Prova Carlos Jacomelli
    Driver: Mario Valentim Dos Santos1st

    Brazilian domestic event, approximately seven months after the Circuito Quinta Boa Vista.

  4. 1952
    GP do Cidade Rio de Janeiro
    Driver: Mario Valentim Dos Santos

    Field included prominent competitors such as Juan Manuel Fangio and José Froilán González.

  5. 1954
    Circuito da Gavea
    Driver: Gino Bianco

    Car was loaned to Bianco for this race and suffered an accident; part of an otherwise productive 1954 season.

  6. 1954-03-01
    Quilometro Lançado-Lagoa Rodrigo
    Driver: Pinheiro Pires1st in class

    One of five podium results achieved during the 1954 season.

  7. 1956-11-01
    Circuito de Volta Redonda Sport
    Driver: Pinheiro Pires2nd
  8. 1957-12-01
    GP Prefeito Negrão de Lima Sport
    6th

    Believed to mark the effective end of the car's active racing career in South America.

  9. 1986
    1986 Mille Miglia Storica
    Driver: Sid Colberg
  10. 2005
    2005 Mille Miglia Storica

    Participated following post-acquisition restoration work by the current owner.

  11. 2006
    Fall Festival at Lime Rock
  12. 2010
    Tutto Italiano

    Attended after a second engine and drivetrain rebuild completed in 2007.

  13. Monterey Historics
    Driver: Sid Colberg

    One of several vintage events the car participated in during Colberg's ownership, following its restoration.

Maintenance & restoration

  1. 1952Engine rebuild
    Maserati factory

    Car was returned to the Maserati factory for repairs; the original cylinder head was replaced with a dual-overhead-cam unit featuring single ignition and an unusual cam arrangement. Believed to represent the first bialbero head produced by Maserati.

    Engine returned to Brazil with the car in December 1952.

  2. 1980Mechanical
    Phil Reilly & Co.

    Further mechanical sorting carried out after the car arrived in San Francisco, including specialist attention to the drivetrain and related systems.

    Marque specialist Ivan Zaremba contributed significantly to this phase of work. Workshop located in Corte Madera, California.

  3. 2004Restoration
    Leydon Restorations

    Comprehensive restoration overseen by the new consignor following acquisition, including an engine refresh.

    Leydon Restorations is based in Pennsylvania.

  4. 2007Engine rebuild
    Nino Epifani

    Engine, gearbox, and steering system rebuilt; driveshaft, universal joint, and fuel tank were also refurbished at the same time.

    Work carried out in Northern California.

  5. 2021Engine rebuild
    Candini Classiche

    New purpose-designed pistons installed to deliberately reduce compression ratio; cylinder head fitted with replacement valves, guides, and springs; new megacycle camshafts installed.

    Work performed in Modena, Italy.

  6. Bodywork
    Grand Prix Metalcraft

    Coachwork correction carried out in North London as the initial phase of a staged restoration begun after the car's arrival in the UK.

    Work preceded shipment of the car to San Francisco in 1980.

  7. Mechanical
    Ted Bailey

    Mechanical refurbishment undertaken in Lincolnshire as part of the same staged restoration phase.

    Bailey was based in Bourne, Lincolnshire.

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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.