In his 1951 rookie season for the New York Giants Willie Mays wore number 14 and his familiar number 24. Davey Williams also wore 14 and Jack Maguire also wore 24.
In 1952 Mays wore 24 but so did Mario Picone, presumably after Mays entered military service.
In 1953 no Giant wore 24. Mays missed the entire season in the Army.
In 1954 Mays wore 24, the number he made famous. He wore 24 for the remainder of his career, even with the Mets in 1972 and 1973.