Reginald Martinez Jackson (1946-) is an American former professional baseball right fielder who played 21 seasons for the Kansas City / Oakland Athletics, Baltimore Orioles, New York Yankees, and California Angels of Major League Baseball (MLB). Jackson was inducted into the National Baseball Hall of Fame in 1993. Signed OML (Selig) ball with 100th anniversary of Yankees stamped on ball also. Ball is pristine. COA from JSA included.