A San Francisco 49ers Speed Slate NFL Mini Helmet hand signed by Nick Bosa. The item and signature are in excellent condition. Nick Bosa is an NFL defensive end for the San Francisco 49ers. He played college football at Ohio State. 2019 Pro Bowl. AUTHENTICATION: The item has been tagged with a SmarTag powered by Prova Technology; which gives you digital access to the item's authentication records; including a proof picture from the signing.