Joe Greene Signed Pittsburgh Steelers M&N Black Jersey Beckett 42790 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 Pittsburgh Steelers Black Mitchell & Ness Jersey that was personally autographed by Joe Greene. Includes a certificate of authenticity from Beckett Authentication Services (BAS) and Denver Autographs.