Ken Griffey Jr. & Ken Griffey Sr. Autographed Official MLB Baseball Seattle Mariners "Back To Back HR 9/14/90" Beckett BAS Witness

This 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.