The Maserati 250F defined 1950s Formula One, leaving an ever-lasting stamp on the front-engined era of top-flight Grand Prix racing. Campaigned by many of the era's luminaries including Juan Manuel Fangio, Alberto Ascari, Stirling Moss, and Mike Hawthorn, it's easy to see why. Its career began in triumphant fashion with victory on debut at the 1954 Argentine Grand Prix in Fangio's hands and shortly after at the Belgian Grand Prix, amassing eight World Championship victories alongside a far greater tally of non-championship glory over the course of its six seasons as Maserati's weapon of choice. Sir Stirling, who took victory with the 250F at the Monaco and Italian Grands Prix, later described it as the best front-engined F1 car he ever drove.

One of the earliest prime authorities on the Maserati 250F was Cameron Millar. Formerly a squadron leader in the Royal Air Force during World War II and an exceptionally talented engineer, Millar was taken by the 250F and acquired his first in 1964. He quickly became a regular patron of the Scuderia Centro Sud where the 250Fs were stabled, buying up spare 250F parts and additional chassis. By 1967, Millar had compiled a vast stockpile of the remaining stock of 250F chassis and parts. Around this time, he was approached by Innes Ireland to help rebuild Fangio's 1957 car, which had been heavily damaged in a crash. It was then that Millar had a realization: he had the facilities and arsenal of authentic components to create his own series of Maserati 250Fs. Between 1972 and 1980, Millar crafted a small crop of “tool room” copies of the 250F; his initial run of ten cars drawing from his exclusive supply of original 250F components.

Millar's 250Fs were thus far more than recreations; exacting reproduction 250Fs built not by Maserati themselves, but with genuine Maserati 250F parts, tools, and processes by the model's principal expert. These cars were so true to form that el Maestro himself purchased one, and it remains on display within the highly curated Museo Fangio in Buenos Aires, Argentina. Perhaps as crucially, the FIA granted the Cameron Millar cars full eligibility to race alongside factory 250Fs in all but the most rigid historic racing events. Millar's cache of original parts was exhausted circa the fifth or sixth car built, making the early examples the most authentic and desirable.

This car, chassis “CM4,” is the fourth of the ten original cars produced by Cameron Millar, and originally ordered by eminent collector Count Hubertus von Döenhoff. As such, it is built from an impressive number of critical components—including the engine, transmission, axles, and brakes—of 250F number 2505: a genuine works 250F of exceptional provenance. Chassis number 2505 was indeed the aforementioned example that achieved the 250F's debut victory in Argentina with Fangio driving—who took the checkered flag with it at Spa-Francorchamps mere months later. This car was campaigned regularly by Officine Alfieri Maserati throughout the 1954 season, additionally scoring a championship win at Pescara (with Luigi Musso behind the wheel) and driven by several additional celebrity drivers including Alberto Ascari, Onofre Marimón, and Harry Schell. The car was sold to privateer teams after the 1954 season, loaned to Scuderia Centro Sud, then returned to Maserati in 1957. Its chassis and body were used to rebuild chassis number 2500, though its innards were crucially left behind. The transformed 250F entered the private Museo Carlo Biscaretti in 1960, where it remains today.

While the first three cars had been built by Aubrey Finburgh, Millar sold the car to Döenhoff and sent all the authentic parts of number 2505 to grand prix restoration specialist Paul Grist to complete CM4, using a body and chassis constructed to 1954/54 Tipo 1 specification. It subsequently entered the care of Count Giovanni “Johnny” Lurani and Corrado Cupellini who kickstarted its vintage racing career. Fully completed to competition specification by 1981, CM4 was first raced by Stephen Griswold at Monza in 1982 and appeared at an exhibition event during that year's Monaco Grand Prix, followed by a drive at St. Moritz in 1984.

The racecar appeared in the May 1985 issue of Thoroughbred and Classic Car, advertising the dealership of Julius Thurgood, before he established the Historic Racing Drivers Club and consulted for Goodwood Revival. Purchased by Count Luigi Castelbarco in 1986, CM4 continued its racing streak that year, notably being driven at Monza by trailblazing Formula One and former 250F driver Maria Teresa de Filippis. So true to the original, for the first several years of its existence, CM4 was believed to be the real chassis number 2505 due to its many numbered authentic parts down to the original stamped cylinder head. Its Historic Technical Passport issued in 1988 even lists it with 2505's identity. FISA was notified of this discrepancy shortly after 2505 was rediscovered, yet CM4's pedigree was upheld. After all, this merely introduced a compelling Theseus's Paradox: as the original car now carried a new stamped identity and retained none of its original mechanical systems—which instead survive within and animate CM4 today. Shortly after receiving its coveted HTP, CM4 was purchased by the first of its two long-term French caretakers, and was subsequently sold to the latter in 1999.

Acquired by the consignor approximately five years ago, CM4 has remained a staple of historic motorsport celebrations across Europe. Steve Hart, the renowned vintage racing specialist in charge of several regular Maserati 250Fs on the historics calendar, has thoroughly conducted CM4's return to race condition with preparation and support for prestigious historic events from 2023 to 2025. The consignor raced CM4 at several events on the Historic Grand Prix Cars Association calendar including the Jerez Historic Festival in 2023; Settimana Motoristica Ennese, Oulton Park Gold Cup, Spa Six Hours, and Silverstone Festival in 2024; as well as the Zandvoort Historic Grand Prix and ADAC Hockenheim Historic in 2025. CM4 captivated historic racing enthusiasts across the continent in fields made up of other 1950s grand prix icons, including multiple other 250Fs and even other Millar cars: chassis CM5 and CM7. The car has further withstood exhaustive testing at distinguished racetracks including Silverstone, Snetterton, and the Nürburgring.

This 1954 Maserati 250F by Cameron Millar is now offered with its all-important Historical Technical Passport, a letter from Cameron Millar himself describing the car, and recent invoices on file from Steve Hart Racing for CM4's restoration, race support, testing, and repairs nearing half a million pounds.

CM4 stands among the most distinguished and expertly chronicled of Cameron Millar's creations; machines regarded by Maseristi worldwide with a reverence close to that of the original Maserati 250F itself. A driving work of museum-worthy sculpture, it captures the sensual form and mechanical purity of post-war Formula One at its height, while containing an authentic 250F engine once instrumental in carrying greats like Fangio and Musso to victory. Yet CM4 is more than a static artifact; with its current FIA Historical Technical Passport valid until 2033, extensive vintage racing history by several consecutive prominent racing enthusiasts, and recent first-class race preparation—it remains eligible for continued participation in the world's premier historic racing events. This stunning racing car offers its next custodian the rare opportunity not merely to preserve history, but to actively experience it behind the wheel.