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Ken Griffey Jr. Autographed Black Cooperstown Baseball Bat Signature Series Baseball Bat Seattle Mariners Beckett BAS Witness FS This is a 1982 DonrussThis is a Black Cooperstown Baseball Bat Signature Series Baseball Bat that has been hand signed by Ken Griffey Jr. This item has been witnessed and certified authentic by Beckett Authentication (BAS) and comes with their tamper proof witness sticker.