Carbo was an outfielder who started his career with Cincinnati. He had been the Reds' number-one draft pick in the inaugural 1965 draft, ahead of Johnny Bench. In his 1970 rookie season, Carbo posted career highs in batting average (.310), home runs (21), runs batted in (63), hits (113), on-base percentage (.454), slugging average (.551), OPS (1,005) and games played (125). Carbo was selected Rookie of the Year by The Sporting News. He was traded to Boston in 1973.

This New Era official Boston Red Sox cap was signed in silver by Carbo and includes a sticker and COA from Fleer.