A 1991 Lamborghini Diablo and several notable Porsche 356 variants will be among the headline entries at the Bonhams Greenwich 2026 auction, which takes place on May 31. It’s being held at the WR Berkley Corporation Headquarters in Greenwich, Connecticut.
The Lamborghini Diablo, pictured above, is estimated at $300,000 to $350,000 and is finished in Midnight Blue Metallic over tan leather, a rare factory-correct combination. Its history includes registrations in Quebec, Alberta and Ontario before the car arrived in Florida only recently. It is accompanied by a service file documenting maintenance carried out during its life.
Porsche is strongly represented at Bonhams Greenwich 2026, led by the above 1957 356A Carrera GT estimated at $500,000 to $700,000, and offered at no reserve. Chassis 101385 was completed on August 9, 1957 and delivered new through Intercaribbean of Cuba to a Cuban lawyer and gentleman racing driver. During 1958, it reportedly achieved several victories in local Cuban competition before being sold and exported to the US through Jacksonville, Florida, in 1959.
The car later disappeared from public view for many years before resurfacing in the early 2000s. Acquired by its current owner as a largely complete restoration project, although without its original engine, it became the subject of a restoration lasting more than 15 years. The owner researched original Carrera GTs in the US and Europe, examined factory records and consulted former Porsche factory department managers to return the car as closely as possible to period specification.
A major element of the project was the acquisition of Type 547/3 four-cam engine no. P90156/666, originally fitted to a 1960 Porsche RS-60 Werks Prototype Spyder, chassis 044. The engine was found complete and reportedly running, with its principal matching-numbered components intact. The car’s restoration also incorporated period-style upgrades, including 5.5-inch wheels, Porsche 904-style instrumentation and a transaxle using later 741 competition-type components. The four-cam motor is still undergoing final restoration and assembly, so the car is currently fitted with a rebuilt 1582cc Porsche pushrod engine for testing and sorting.
The above 1956 Porsche 356A T1 Speedster by Reutter carries an estimate of $250k to $300k and is offered at no reserve. Chassis 83066 was originally delivered through Hoffman Motors of New York on March 12, 1957. A 1975 Porsche letter signed by Jürgen Barth verifies its original red over black leatherette colour scheme, while the original windscreen still carries Northwestern University parking decals from 1966 and 1967.
After many years in the Midwest and a period of storage in Missouri, the car was acquired in Chicago in August 2013. It then underwent a refurbishment from December 2016 to April 2023. The body was stripped to bare metal by The Tin Man’s Garage, revealing the factory red finish. Repairs addressed previous rear-end damage and included replacement of the rear clip, passenger door skin, floors and battery box. It was repainted black by Posematos’s Bodyworks and Restorations.
The original engine is no longer fitted. A correct-type Type 616/1 flat-four has been rebuilt and enlarged to 1720cc, using Wilhoit cylinder heads, JE forged pistons, a DPR 74mm counterweighted crankshaft and an LN Engineering camshaft. It runs dual Solex PBIC carburettors.
Meanwhile, the gearbox, drum brakes, wiring harness and instruments have also been rebuilt or restored. The car now has tan leatherette trim, oatmeal square-weave carpets, Coco mats, rechromed steel wheels and Pirelli Cinturato tyres. It is offered with documentation, refurbishment records, side curtains, half tonneau, car cover, replica tool kit and original windscreen glass.
Completing the Porsche 356 trio is a 1961 356B Super 90 Cabriolet, also bodied by Reutter. Estimated at $200k to $250k, it is presented in its original Signal Red over black leather colour scheme. The car was delivered new through AFN Ltd in England around April 1961 and retains its matching-numbers Super 90 engine. It has previously received a full restoration and is offered with a Porsche Certificate of Authenticity.
Keeping to the Stuttgart theme, there are a couple of rarities in the Bonhams Greenwich 2026 sale. The above 1971 Mercedes-Benz 280 SE 3.5 Cabriolet, chassis 11102712002325, was delivered new in 1971. It originally left the factory in 744 Dunkelblau, or Dark Blue, with Black leather interior trim. During a comprehensive restoration completed more than ten years ago, the car was refinished in Black and retrimmed in Cognac leather. The work included attention to the interior materials, wood veneers, chrome trim and switchgear. It’s estimated at between $280k and $320k.
This 1970 Mercedes-Benz 600 Pullman Limousine has had single ownership since 1978. Originally specified as a six-door model, it was ordered with air-conditioning, a privacy partition, sunroof, leather driver’s compartment, velour rear cabin, wood trim, rear bar and cocktail compartment, privacy curtains, vanity mirrors, rear radio controls and a Becker radio.
Early in its life, two of the six exterior door handles were professionally removed, giving it the appearance of a four-door Pullman, although the additional door hinges remain visible. Finished in metallic blue, it has spent much of its life in Southern California and has covered less than 98,000km. No estimate has been revealed, but it is being offered at no reserve.
Stepping away from the Germans, this Dodge Viper is number 004 of 100 VOI.9 Edition cars built for the ninth Viper Owners Invitational in Las Vegas. Finished in white with blue stripes, it features VOI.9 badging, blue interior trim, a black shifter boot and a numbered console plaque. It is one of 16 cars fitted with the Prefix Special Edition Aero Package, adding an adjustable carbonfibre front splitter and large rear wing. It is also one of ten fitted with the Mopar Performance Package, including a competition camshaft, headers and exhaust, raising output to at least 550bhp and 580lb ft. It is believed just two cars are so-equipped. It has covered 5046 miles, and is being offered at no reserve; no estimate has been revealed.
This 1967 Morgan Plus Four Low-Line Super Sport Two-Seater, chassis 6388, was built in left-hand-drive, US-market specification and is recognised by Morgan as originally finished in Westminster Green with black leather. It was equipped with 72-spoke wire wheels, disc brakes, wood-rimmed steering wheel, heater and defroster, rear bumper and a badge bar with foglamps. Dispatched on December 20, 1966, it was sold new by Louwman & Parqui in Leidschendam, Holland.
The car later moved to the United States and was bought by Gary Lee Webb in the New Orleans area. In 1985 it was sold to Michael Norton of Metairie, Louisiana for $1000, showing 25,012 miles. Later that year it reportedly passed to Thomas Mossman, who kept it for 23 years. Peter Castner of Massachusetts acquired it in 2008 with 40,752 miles recorded, before the current owner bought it in April 2023 showing 42,443 miles.
Service records cover around 30 years. In 2024, Morgan Motors of New England carried out mechanical work including fuel-system servicing, gaskets, engine mounts, steering, suspension and Weber carburettor rebuilding. The car now shows around 43,650 miles and retains largely original paint. It has a rare hard-top, soft-top, tonneau and side curtains, and won a 2023 Speed and Style Festival award. No estimate had been revealed at the time of writing.
This 1958 Alfa Romeo Giulietta Spider Veloce, chassis AR149505063, was delivered new to Max Hoffman in New York in December 1958. Its identity is supported by an Alfa Romeo Certificato di Origine and Centro Documentazione correspondence, with engine-block stamping AR131531917 recorded as consistent with factory records.
The car was refurbished by Alfisti Motorsports of Bloomington, Illinois between 2008 and 2012. The work included rotisserie body preparation, a repaint in red rather than its original Celeste Blue, and rebuilding of the 1290cc twin-cam engine and transmission. Further work was carried out in 2023 by Dominick’s Shop of White Plains, New York, including refitting the original cold-air intake, synchronising the twin Weber carburettors, and installing a new starter motor and battery.
In 2026, The Paddock Shop in New Britain, Connecticut overhauled the suspension and brakes, reinstalled the original front drums, changed the oil and fitted a new exhaust. It won first place at an AROC event in 2011 and was acquired by the current owner in 2023. It’s being offered at no reserve at the Bonhams Greenwich 2026 sale, although no estimate was revealed at the time of writing.
Something very rarely seen on US soil is this 1992 Maserati Shamal. Chassis ZAM339B00MA300115 was imported to the US from Japan in April 2018. It’s covered 74,013km and no estimate has been revealed.
Further details
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