You can view this item on the Beckett Authentication website and it shows when and where the item was signed.
This is a Cincinnati Bengals AMP mini helmet that was personally autographed by Tee Higgins. This helmet includes a certificate of authenticity from
Hand Signed by Tee Higgins, - Cincinnati Bengals Speed Authentic Helmet, - Radtke Sports Certificate of Authenticity, - Radtke Sports Serial