Trevon Diggs Dallas Cowboys Autographed Speed Mini-Helmet Autographed mini-helmet of Cowboys star Trevon Diggs - authenticated by James Spence Authentication (JSA) This officially licensed speed mini-helmet has been hand-signed by Cowboys star Trevon Diggs. All autographed memorabilia comes with a certificate of authenticity and a matching hologram. Hand-Signed by Cowboys star Trevon Diggs Signature is bold and clear on the mini-helmet Official NFL Riddell mini-helmet Includes JSA certificate of authenticity and matching hologram