DK Metcalf Autographed/Signed Pro Style White XL Jersey BAS 28327 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 DK Metcalf. Includes a certificate of authenticity from Beckett Authentication Services (BAS) and Denver Autographs.