Nicknamed "The Killer" and "Hammerin' Harmon", Harmon Killebrew was an American professional baseball first baseman, third baseman, and left fielder. He was a prolific power hitter who spent most of his 22-year career in Major League Baseball with the Minnesota Twins. Presented is a Minnesota Twins jersey autographed by Harmon Killebrew. The jersey itself is a Cooperstown Collection -- Mitchell & Ness [size] M. He signed the jersey in blue felt tip ("9") with the inscription, "573 H.R.'s". Authentication: PSA/DNA Full Letter Harmon Killebrew Signed Jersey