A Detroit Lions Speed Flex Authentic Salute To Service NFL Helmet hand signed by Calvin Johnson & Barry Sanders. The item and signatures are in excellent condition. Calvin is a former NFL Wide Receiver for the Detroit Lions. Barry is a former professional football player who was a running back for the Detroit Lions. AUTHENTICATION: Your item has been tagged with a SmarTag powered by Prova Technology, which gives you digital access to your items authentication records, including a proof picture from the signing.