This Autographed Game Used Old Hickory Cracked Baseball Bat with the inscription of "GU" has been Personally Signed by Paul Goldschmidt of the Arizona Diamondbacks. This item is 100% Authentic to include a hologram by Beckett Authentication Services. This item will come with an affixed Beckett Authentication Services (BAS) authentication sticker, which includes a scannable QR code to verify authenticity. Please note that Beckett no longer provides serial-numbered COA cards, and the attached BAS sticker will serve as the complete authentication for this item. The authenticity can be verified on Beckett Authentication Services website.