Mark McGwire hand-signed this Official Major League Baseball in person at Coors Field when the Cardinals played the Rockies.  Mark enjoyed a 15-year MLB career with 12 A–Star appearances, 5-time MLB home run leader, AL Rookie of the Year and so many other awards.  He ended his career with 583 home runs, which was 5th at the time of his retirement.  This baseball is in immaculate condition, comes in the holder with the baseball card shown in photo and was also sent to Spencer to prove authentication.  This signature is very clean and legible and a cool piece for any Big Mac fan.