Michael Mayer Signed Note Dame Fighting Irish F/S Shamrock Helmet BAS 38782 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 Notre Dame Fighting Irish full size shamrock replica helmet that was personally autographed by Michael Mayer. Includes a certificate of authenticity from Beckett Authentication Services (BAS) and Denver Autographs.