Baker Mayfield, Kyler Murray and Sam Bradford, former Heisman Trophy winning quarterbacks for the Sooners, have each hand signed this Oklahoma Riddell Speed full-size replica helmet at a private signing. Each player included his Heisman inscription. This item comes with a certificate of authenticity (COA) from Beckett Authentication Services and was signed in the presence of one of their representatives. 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.