Rob Gronkowski signed items are top sellers among sports memorabilia. This Rob Gronkowski Autographed 16x20 Photo New England Patriots - Certified Authentic comes fully certified by Seller and will come with COA and matching sticker. This Rob Gronkowski signature is very bold and will not fade over time. Signed New England Patriots Prime One Sports hold their value for generations. Start your Rob Gronkowski memorabilia collection today. Your order ships out same day.