This 1958 Fiat-Abarth 750 GT Zagato was completed on February 15, 1958, for export to the US and was delivered new to a New York owner who is said to have campaigned it in SCCA competition. Chassis 399892 was imported to the UK by its current owner in 2005 and subsequently received a multiyear refurbishment that included the installation of a 785cc AH-block OHV inline-four with a single Weber carburetor. Competition-style equipment includes plexiglass rear and side windows, an expanded-capacity fuel tank, large-diameter finned aluminum front drum brakes, an underbody auxiliary radiator, buttress-style bucket seats, and a Nardi wood-rimmed steering wheel. Finished in silver over aluminum bodywork, the car also features a four-speed manual transaxle, painted 12” Borrani wheels, a dual-exit exhaust system, and blue interior upholstery. This “Double Bubble” 750 GT Zagato is now offered on dealer consignment in Essex, England, with Fiat Classiche certification, an Abarth Squadra Storica certificate, a vehicle authentication statement from Abarth specialist Greg Paris, a jack, and UK registration. Development of the Abarth-engineered 750 GT began in 1955 on the Fiat 600 platform, with the production version debuting in March 1956 with aluminum coachwork by Milan’s Zagato. Styling incorporated a double-bubble roof profile, twin intake scoops on the rear decklid, aluminum bumperettes, and dual vents on each sail panel. Produced through 1960, the platform accounted for racing successes in the US and Europe including a class win in the 1957 Mille Miglia. This example is said to have undergone a refurbishment in the Netherlands under current ownership, with work including a repaint in silver before the car was returned to the UK for completion of the project. Features include faired-in Marchal headlights, aluminum-framed plexiglass side and quarter windows, a plexiglass rear window, pop-out door handles, a round Fiat nose badge above an Abarth shield, and a “Campione Italiano” badge on the rear decklid. Silver-painted Borrani wheels wear bright Abarth hubcaps and are wrapped in 5.40-12 Camac tires, while a matching spare is secured in the front compartment. Stopping is handled by hydraulic drum brakes with helical aluminum fins up front. Independent suspension incorporates a transverse front leaf spring, a semi-trailing-arm rear setup with coil springs, and hydraulic shock absorbers all around. The cabin houses bucket seats that feature flying-buttress side bolsters along with slotted backrests and cushions and were re-trimmed in blue upholstery with white piping under current ownership. Matching upholstery covers the door panels and rear bulkhead, while gray carpeting lines the floors, center tunnel, and rear shelf. Additional features include machine-turned plates on the lower doors and thresholds, leather rear luggage straps, and a “Mille Miglia Motore” dash badge. The Nardi wood-rimmed steering wheel sits ahead of Jaeger instrumentation including an 8,600-rpm tachometer, a 120-mph speedometer, and a combination gauge monitoring fuel level, coolant temperature, and oil pressure. The five-digit odometer shows 118 miles, and true mileage is unknown. The OHV inline-four reportedly features an Abarth AH block supplied by an Abarth specialist and is said to have been rebuilt to a displacement of 785cc during the refurbishment. Components are said to include a steel Mille Miglia-specification crankshaft, custom forged dome-type Ross Racing pistons, H-beam connecting rods with ARP bolts, and a ported and polished cylinder head with an Abarth camshaft, customized Mitsubishi Evo valves, Schrick single springs, and bronze guides. The engine breathes through a single Weber 32 IMPE 7 carburetor and an Abarth drum-style air cleaner, while additional Abarth touches include a finned alloy oil sump and two-into-one exhaust headers. Additional specifications provided by the seller can be viewed in the gallery below, as can a photo of the AH casting on the block. An extended-range fuel tank is present in the front compartment. Power is sent to the rear wheels via a four-speed manual transaxle. An auxiliary radiator is mounted underneath the floorboards ahead of the gearbox. A statement of authentication from Abarth historian Greg Paris is shown above and outlines the features of competition variants of the 750 GT Zagato, while describing this car as one of a handful of cars prepared for competition by the factory. Documents shown in the gallery below include certificates from Fiat Classiche and Centro Storico Fiat, a certificate from Abarth Squadra Storica, correspondence from the car’s owner between 1960 and 1964, and correspondence between a previous owner and Abarth regarding a replacement engine between 1967 and 1968. The car is registered in a country that does not issue titles for vehicles. It is being sold on its British V5 registration document.