Mariano Rivera Autographed Rawlings OML Baseball W/ Enter Sandman- JSA Auth This is a Mariano Rivera hand autographed Rawlings Official Game Ball Major League Baseball. This item has a James Spence Authentication, which comes with a JSA numbered sticker and a matching JSA Certificate of Authenticity. You can view this item on the SpenceLOA website. It 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, brand new, and in great shape.