This Autographed White Nike Jersey has been Personally Signed by Jacob deGrom of the New York Mets. 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. This is a X-Large sized Jersey. The jersey was also previously authenticated by JSA, but it will not come with its matching JSA card. Its authenticity can still be searched and verified in JSA's database.