Adrian Peterson Autographed Oklahoma Sooners 16x20 HM Photo TD vs Texas Tech - Beckett Witness This is a hand autograph of Adrian Peterson of the Oklahoma Sooners on a 16x20 Photograph by Highland Mint. This item has a Beckett Witness Authentication, which comes with a numbered sticker and a matching Certificate Of Authenticity. You can view this item on the Beckett Authentication website, and it shows when and where the item was signed. This item was signed either at a public autograph appearance or a private signing. This is a stock photo of the item. Although you may not receive this exact item, the item you receive is virtually identical and brand new in great shape.