Houston Colt .45s Vintage / Retro Style T-Shirt Before they were the Houston Astros, they were the Houston Colt .45s! But only from 1962-1964 The Houston Colt .45s were one of the expansion teams that joined the National League in 1962. The team’s name was a reference to the Colt .45 revolver, and their logo featured a stylized depiction of a Colt .45 revolver. With the completion of the Astrodome, the team moved into the new facility for the 1965 season, and along with the move, the team also changed its name to the Houston Astros, reflecting the city’s connection to the space industry and the futuristic nature of the Astrodome. Please refer to the sizing chart when ordering to ensure proper fit.