Rob Gronkowski New England Patriots Autographed Riddell Mini Helmet w/GA coa. The item "Rob Gronkowski Autograph Signed New England Patriots Mini Helmet COA Hologram" is in sale since Tuesday, March 26, 2019. This item is in the category "Sports Mem, Cards & Fan Shop\Autographs-Original\Football-NFL\Helmets". The seller is "sportsgo123" and is located in Wills Point, Texas. This item can be shipped to United States.