Legacy Metrics

1929 Alfa Romeo 6C 1750 Super Sport

0312901roadItaly
Engine
1.75L supercharged inline-six, twin-cam, numbers-matching
Colour
Black

A 1929 Alfa Romeo 6C 1750 Super Sport, one of just 121 built that year, this chassis was delivered new to Genoese industrialist Alfredo Nasturzio and subsequently passed through several Italian hands before emigrating to South Africa in 1939. Dr. Hugh Gearing of Johannesburg owned it for roughly six decades, competing in local hillclimbs and rallies, and on one occasion in 1992 Juan Manuel Fangio drove the car at a Pirelli demonstration event at Kyalami. The car's distinctive doorless steel coachwork is attributed to an Italian coachbuilder, likely Carrozzeria Aprile of Savona, circa 1938. A full mechanical restoration was completed after 2012, and the car has since earned multiple concours awards.

Ownership

  1. Auction sale
  2. 1929-05-13 →Factory delivery
    Alfredo Nasturzio
    full documentation

    Purchased new through Genoese dealer Eraldo Diana for 75,000 lire; Alfredo was a prominent industrialist from Genoa and an early VIP client of Alfa Romeo.

  3. 1931 → 1932-09-15Private sale
    Rosalino Arzani
    full documentation

    Based in Diano Marina on the Ligurian Coast; registered the car under Imperia provincial plate IM 2483.

  4. → 1931-06-01Private sale
    Tito Nasturzio
    full documentation

    Alfredo sold the car to his brother Tito roughly 17 months after original purchase; Tito sold it on by June 1931 when both brothers moved to newer Gran Sport models.

  5. 1931-06-01 → 1931Private sale
    Gio Batta Barilaro
    partial documentation

    Brief ownership; car passed onward before the end of 1931.

  6. 1932 → 1933-08-01Private sale
    Attilio Patroni
    partial documentation

    Genoese resident who acquired the car within a month of Cavallino's purchase.

  7. 1932-09-15 → 1932Private sale
    Gio Batta Cavallino
    full documentation

    Resident of Savona; registered the car as SV 2550 but held it for under a month.

  8. 1933-08-01 → 1936Private sale
    Giovanni Caviglia
    partial documentation

    Held the car for approximately three years.

  9. 1938-07-01 → 1939-01-30Private sale
    Ercole Bonfiglio
    full documentation

    Based in Savona; registered the car as SV 5122. Current coachwork is believed to have been fitted around this period, possibly by Carrozzeria Aprile of Savona.

  10. 1939-01-30 → 1950Private sale
    Gianni Vallero
    full documentation

    Resident of Durban, South Africa; Italian export declaration issued May 1942, well after the car had already been shipped south. A 1939 photograph of the car in Durban was discovered in an Italian Consulate publication.

  11. 1950 →Private sale
    Dr. Hugh Gearing
    partial documentation

    Johannesburg-based owner who kept the car for roughly six decades; regularly campaigned it in local hillclimbs and rallies, and the car was fully maintained throughout.

  12. 2012-11-01 →Private sale
    Consignor
    full documentation

    Acquired after the car left the Gearing estate; commissioned a thorough mechanical restoration at Automotive Restorations, Inc. in Connecticut, documented by invoices on file.

Competition

  1. 1992
    Pirelli demonstration event at Kyalami Circuit
    Driver: Juan Manuel Fangio

    Car was loaned by Gearing to Fangio for a demonstration run; Fangio drove with evident enthusiasm and praised the car on exiting.

  2. 2015
    2015 Elegance at Hershey Concours
    Most Elegant Sports and Racing Car

    First major concours appearance following the post-2012 restoration; top award in the sports and racing category.

  3. 2017-09-01
    2017 Lime Rock Park Historic Concours
    Best in Class — Pre-WWII Coachbuilt category
  4. 2017-09-01
    2017 Boston Cup
    Best in Italian Class

    Awarded in the same month as the Lime Rock concours.

  5. Local hillclimbs and rallies near Johannesburg
    Driver: Dr. Hugh Gearing

    Gearing regularly entered the car in hillclimb and rally events on the challenging terrain around Johannesburg over the decades of his ownership.

Maintenance & restoration

  1. 1938Bodywork
    Carrozzeria Aprile

    New coachwork believed to have been fitted by an Italian coachbuilder, tentatively identified as Carrozzeria Aprile of Savona. The resulting body is a doorless steel design intended for vigorous road use rather than sanctioned competition.

    Attribution is presumed rather than documented; marque historian John de Boer noted the distinctive construction style.

  2. 2012
    Inspection

    Pre-restoration assessment by marque historian John de Boer, which noted the presence of a later-series Memini carburetor and a period but later-series four-speed gearbox, believed to be early upgrades already on the car when Gearing acquired it.

    Findings documented on file.

  3. 2013Restoration
    Automotive Restorations, Inc.

    Full mechanical restoration carried out to a thorough standard, covering all aspects of the car's mechanical requirements. A complete rebuild of the numbers-matching 1.75-litre engine was included in the scope of work.

    Workshop is based in Stratford, Connecticut; work is documented by a comprehensive set of invoices on file.

  4. 2013Engine rebuild
    David L. George Historic Motorcars

    The period supercharger was fully rebuilt by a specialist workshop commissioned separately from the main restoration contractor.

    Workshop is based in Cochranville, Pennsylvania.

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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.