This is an Official MLB Baseball that has been hand signed by Ken Griffey Jr. Griffey inscribed this baseball with his career uniform numbers: "3, 17, 42, 24, & 30." This item was signed in the presence of a Mill Creek Sports representative and comes with their serial numbered hologram and matching certificate of authenticity. This item has been certified authentic by Beckett Authentication (BAS) and comes with their tamper-proof QR Code sticker that can be verified on the Beckett-authentication.com.