Nate MacKinnon Autographed/Signed Colorado Avalanche 11x14 Photo JSA 43470 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 11x14 Photo that was personally autographed by Nathan MacKinnon. Includes a certificate of authenticity from James Spence Authentication (JSA) and Denver Autographs.