Ferrari 375 MM, was a race car produced by Ferrari in 1953 and 1954. It was named "375" for the per-cylinder displacement in the 4.5L V12 engine, and the "MM" stood for the Mille Miglia race. The engine was based on its Ferrari 375 F1 counterpart, but with shorter stroke and bigger bore. The first prototype was a Vignale Spyder and 3 next cars were Pinin Farina Berlinettas, all converted from Ferrari 340 MM. Perhaps the most known 375 MM is the "Ingrid Bergman" version, commissioned in 1954 by director Roberto Rossellini for his wife, actress Ingrid Bergman. The Bergman 375 MM was subsequently bought and restored by the Microsoft executive Jon Shirley and the restoration specialist Butch Dennison. It later became the first postwar Ferrari to win Best of Show at the Pebble Beach Concours d'Elegance.