This autographed full size Riddell Speed helmet has been personally hand-signed by Christian Okoye of the Kansas City Chiefs. This autograph is certified by PSA/DNA?s (Professional Sports Authenticators) In The Presence authentication. That means that a PSA representative was present when this item was signed. It comes with the PSA numbered authentication hologram which can be verified on the PSA website, psacard.com. On October 23rd, 2023 PSA made an announcement that they will no longer be issuing COA cards to match the holograms. If an item authenticated by PSA does not come with a COA card, it is still considered fully authenticated.