Christian McCaffrey, former All-American running back for the Cardinal, has hand signed this Stanford Riddell Speed mini helmet at a private signing. This item comes with a certificate of authenticity (COA) from Beckett Authentication Services, one of the top authenticators in the industry. You will receive a serial-numbered COA along with a matching serial-numbered sticker on the helmet. The authenticity can be verified online by entering the serial number.Item pictured may not be the exact item you will receive. It will be similar quality, and we guarantee your satisfaction.