1950 Maserati A6GCS 2000 'Monofaro'
- 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
- —Auction saleSold US$1,088,500
- 1950 → 1953Factory deliveryMario Valentim Dos Santosfull 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.
- 1953 →Private salePinheiro Pirespartial documentation
Actively raced the car in South American events through at least 1956; the car's history following late 1957 is unresolved.
- 1972 → 1973Private saleColin Crabbepartial 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.
- 1973 → 1977Private saleAlan Smithpartial documentation
Derby-based owner who undertook only limited restoration work before selling on.
- 1977 → 1978Private saleDanny Marguliespartial documentation
Dealer who held the car briefly before it moved on via an intermediary.
- 1978 → 2004Private saleSid Colbergfull 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.
- 2004 →Private saleCurrent consignorfull 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
- 1951Gran Premio di InterlagosDriver: 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.
- 1951-04-01Circuito Quinta Boa VistaDriver: Mario Valentim Dos Santos2nd
Local Brazilian circuit event; detailed in a report compiled by researcher Maurício Marx.
- 1951-11-01Prova Carlos JacomelliDriver: Mario Valentim Dos Santos1st
Brazilian domestic event, approximately seven months after the Circuito Quinta Boa Vista.
- 1952GP do Cidade Rio de JaneiroDriver: Mario Valentim Dos Santos
Field included prominent competitors such as Juan Manuel Fangio and José Froilán González.
- 1954Circuito da GaveaDriver: Gino Bianco
Car was loaned to Bianco for this race and suffered an accident; part of an otherwise productive 1954 season.
- 1954-03-01Quilometro Lançado-Lagoa RodrigoDriver: Pinheiro Pires1st in class
One of five podium results achieved during the 1954 season.
- 1956-11-01Circuito de Volta Redonda SportDriver: Pinheiro Pires2nd
- 1957-12-01GP Prefeito Negrão de Lima Sport6th
Believed to mark the effective end of the car's active racing career in South America.
- 19861986 Mille Miglia StoricaDriver: Sid Colberg
- 20052005 Mille Miglia Storica
Participated following post-acquisition restoration work by the current owner.
- 2006Fall Festival at Lime Rock
- 2010Tutto Italiano
Attended after a second engine and drivetrain rebuild completed in 2007.
- —Monterey HistoricsDriver: Sid Colberg
One of several vintage events the car participated in during Colberg's ownership, following its restoration.
Maintenance & restoration
- 1952Engine rebuildMaserati 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.
- 1980MechanicalPhil 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.
- 2004RestorationLeydon Restorations
Comprehensive restoration overseen by the new consignor following acquisition, including an engine refresh.
Leydon Restorations is based in Pennsylvania.
- 2007Engine rebuildNino 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.
- 2021Engine rebuildCandini 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.
- —BodyworkGrand 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.
- —MechanicalTed Bailey
Mechanical refurbishment undertaken in Lincolnshire as part of the same staged restoration phase.
Bailey was based in Bourne, Lincolnshire.
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