Trevon Diggs Autographed Dallas Cowboys Flash Mini Helmet JSA 36837 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 Dallas Cowboys flash speed mini helmet that was personally autographed by Trevon Diggs. Includes a certificate of authenticity from James Spence Authentication (JSA) and Denver Autographs.