The Monogram model is supposed to represent the car as it was in 1965, with a larger 3.3-liter engine, hence the "275" name that represents the displaced volume of each cylinder. The original "250P" came in 1963 and won at Le Mans with Lorenzo Bandini and Ludovico Scarfiotti, and in 1964 with Jean Guichet et Nino Vacarella. But the Monogram decals are for the 1964 car, so Monogram cheated by calling their model a "275", it is actually the 250P as raced in 1964.
In 1963, John Surtees brought the original prototype, chassis 814, built without the huge windshield required by the Automobile Club de l'Ouest at Le Mans, to race in the United States, at the request of Luigi Chinetti of NART, who imported the Ferraris in the US. Surtees added the ineffective but legal roll hoop to 814 to compete in the Times Grand Prix as well as 3 other races in North America. Below he can be seen testing that very car at the Modena test track in February 1963:
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Surtees found that the 3-liter car was a bit short of ponies against the American V8s, qualifying in 11th spot and and finishing 4th, but 2 laps down Dave MacDonald, who cleaned everyone's clock in Shelby's Cooper Monaco fitted with a 289 CI Ford engine. Pedro Rodriguez was third in a Genie-Ford using the same kind of engine.
Amazingly, Roger Penske finished in 2nd spot (albeit a lap down) with what was by now an antique motorcar: the modified Cooper "Zerex Special" with one of the 2.8-liter engines used by Jack Brabham at the 1961 Indy 500, the very engine that had won the Times Grand Prix 2 years earlier!
Also don't forget the rivet/bolt detail on the silver side strip.
Joe, good point! In fact these rivets are aluminum "carriage" bolts... and the strip is strictly cosmetic, there were still non-functional bits on racing cars, especially at a time when Ferrari had little competition, that is, in Europe!