American Masten Gregory began his racing career in the beginning of the 1950s driving in SCCA sportscar races. Throughout 1954 and 1955 Gregory competed in Europe, usually driving Ferraris. In 1957 he got a drive with Guglielmo Dei’s Scuderia Centro Sud, a privateer Formula One team using the Maserati 250F. His first race was the 1957 Monaco Grand Prix, where he scored an impressive third-place finish, the first podium for an American in an F1 Grand Prix. He followed this with a string of good results, coming eighth in the German Grand Prix, and fourth in both the Pescara and Italian Grands Prix. Despite only competing in half of the races, Gregory ended the 1957 season in sixth place in the championship.
| Season | Series | Event |
| 1957 | F1WC | Italian GP |
| Driver | No. | Entrant |
| Masten Gregory | 26 | Scuderia Centro Sud |
| Scale | Manufacturer | Collection |
| 1:43 | Brumm | |
| Cat. No. | Quality | Rarity |
| R136B | 
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