1989 Fleer #17 Mark McGwire Hidden Treasures with a Piece of Authentic Mark McGwire GAME USED BAT Graded BGS BECKETT 10 MINT GGUM Card High Grade Mark McGwire Card with a Piece of Authentic Mark McGwire Game Used Bat Includes Original Gamed Used Bat Piece that Mark McGwire used in a MLB Game ! Graded Authentic By Beckett and GGUM Cards US Patent #7,308,986 Very Unique Must have McGwire Collectible! Makes a great gift for all McGwire Fans Check out our 100s of ther Boxes,Sets,Supplies+Great GGUM Game Used Cards