CLINT DEMPSEY SIGNED USA SOCCER BALL BECKETT BAS COA F23379 UMNT WORLD CUP. All my items have been obtained in person at various different events and autograph signings. This item was authenticated by Beckett Authentication Services (BAS). They are the worlds leaders in autograph authentication. This ball will come with a COA that is issued by Beckett. You can go to the Beckett Authentication Service’s website and verify the autograph by entering the certificate number. The certificate number for the item is listed in the title and is on the COA. Listing and template services provided by inkFrog.