Jeremy Shockey Autographed/Signed College Style White XL Jersey JSA 28071 This is a custom college style white XL jersey with sewn on name and numbers that was personally autographed by Jeremy Shockey. This jersey includes a certificate of authenticity from James Spence Authentication (JSA) and Denver Autographs. The number in the listing title is just an inventory sku for our records and is not the authentication number.