O.J. Simpson Autographed/Signed Pro Style White XL Jersey JSA 30371 The number in the listing title is just an inventory sku for our records and is not the authentication number. This is a custom pro style white XL jersey with sewn on name and numbers that was personally autographed by O.J. Simpson. Includes a certificate of authenticity from James Spence Authentication (JSA) and Denver Autographs.