Nate MacKinnon Autographed/Signed Colorado Avalanche Jersey BAS 42021 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 Colorado Avalanche Maroon Jersey that was personally autographed by Nate Mackinnon. Includes a certificate of authenticity from Beckett Authentications Services (BAS) and Denver Autographs.