Xabi Prieto Signed Soccer Ball Spain Beckett BAS COA. This Xabi Prieto autographed Soccer Ball has been personally hand-signed by Xabi Prieto. Like all pieces on our site, this item is guaranteed 100% authentic. Value will likely increase so take advantage of this. Beckett does not issue Certificate of Authenticity cards anymore. The COA is now online through a QR Code located on the sticker affixed to the item. We also carry additional Futbol Memorabilia and other Soccer Autographs.