Nathan Mackinnon Autographed Colorado Avalanche Mini Helmet Beckett 37933 The number in the listing title is just an inventory sku for our records and is not the authentication number. This is the exact item that you will receive so please see pictures for condition. This is a Colorado Avalanche mini helmet that was personally autographed by Nathan Mackinnon. Includes a certificate of authenticity from Beckett Authentication Services (BAS) and Denver Autographs.