Ken Griffey Jr. & Ken Griffey Sr. Autographed Official MLB Baseball Seattle Mariners "Back To Back HR 9/14/90" Beckett BAS Witness 05-18-MIL This is a 1974 Topps

This is a 1974 Topps Card #521 that has been hand signed by Ken Aspromonte and Clay Bryant

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This is a 8x10 Photo that has been hand signed by George Chuvalo

This is an 8x10 Photo that has been hand signed by Pierre-Marc Bouchard

Ken Griffey Jr. & Ken Griffey Sr. Autographed Official MLB Baseball Seattle Mariners "Back To Back HR 9/14/90" Beckett BAS Witness 05-18-MIL This is a 1974 ToppsThis is an Official MLB Baseball that has been hand signed by Ken Griffey Jr. and Ken Griffey Sr. This item was inscribed "Back To Back HR 9 14 90." This item has been witnessed and certified authentic by Beckett Authentication (BAS) and comes with their tamper proof witness sticker.