Celebrate one of baseball most prolific power hitters with this Official American League Baseball hand signed by Oakland Athletics slugger Mark McGwire. McGwire burst onto the Major League scene with 49 home runs in 1987 and became a central figure on the Athletics clubs that reached three consecutive World Series from 1988 through 1990, winning the championship in 1989. Known for his tremendous power, the 12 time All Star finished his career with 583 home runs and became one of the defining sluggers of his era. The autograph has been independently authenticated by James Spence Authentication JSA and is accompanied by a JSA Certificate of Authenticity COA.