This New York Jets Riddell full-size replica helmet has been hand signed by the 4 members of the New York Sack Exchange; Mark Gastineau, Joe Klecko, Marty Lyons and Abdul Salaam. This item comes with a certificate of authenticity (COA) from JSA - James Spence Authentication 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.