Michael Mayer Autographed/Signed College Style Blue XL Jersey Beckett 36978 The number in the listing title is just an inventory sku for our records and is not the authentication number. The item pictured is a stock photo unless otherwise noted. This is a custom college style blue XL jersey with sewn on name and numbers that was personally autographed by Michael Mayer. Includes a certificate of authenticity from Beckett Authentication Services (BAS) and Denver Autographs.