Amari Cooper Oakland Raiders autographed memorabilia. Add this Amari Cooper Autographed Oakland Raiders Mini Helmet - Includes Deluxe Display Case and Name Plate - JSA Authenticity to your Oakland Raiders signed memorabilia collection. This product has been authenticated by JSA and comes with a Certificate of Authenticity and matching taper-evident hologram. All Sports Collectibles memorabilia is backed by our 100% Money Back Guarantee. Get your authentic Amari Cooper Autographed Mini Helmets from Sports Collectibles Online. This bold Amari Cooper signature is authentic and can be an excellent addition to your man cave, home or office.