A Tampa Bay Buccaneers Speed Replica White Throwback 1976-1996 NFL Helmet hand signed by Rob Gronkowski. The item and signature are in excellent condition. Rob is a 5x All-Pro First Team, 5x Pro Bowler, and 2x Super Bowl Champion. AUTHENTICATION: Your item is tagged with a Rob Gronkowski exclusive SmarTag powered by Prova Technology, which gives you digital access to your items authentication records, which includes a proof picture from the signing.