This is an Official MLB Baseball that has been hand signed by Ken Griffey Jr. This item was inscribed "MLB Debut 4-3-89." This item has been witnessed and certified authentic by Beckett Authentication (BAS) and comes with their tamper-proof witness sticker. Beckett Authentication has recently changed their physical certificate card policy where they no longer match their tamper-proof sticker with a physical certificate. A certificate can be printed on Beckett's website for the matching authentication number.