What number did Mickey Mantle first wear when he came up with the New York Yankees?

In 1951 — Mantle’s first year with the team — he switched from number six to number seven in the middle of the season. He went on to wear number seven for the rest of his Hall of Fame career, and even donned the number during a brief stint as first base coach in 1971. The Yankees retired his number on Mickey Mantle Day — June 8, 1969.