A New England Patriots Mitchell & Ness Authentic 2010 Navy Blue NFL Jersey 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.