Craig Krenzel Autographed Ohio State Buckeyes Mini Helmet 02 NC 20971 This is an Ohio State Buckeyes Riddell mini helmet that was personally autographed by Craig Krenzel with 02 NC inscripiton. This helmet includes a certificate of authenticity from Denver Autographs. The number in the listing title is just an inventory sku for our records and is not the authentication number.