DetailsTHE MINI HELMET WAS HAND SIGNED BY TYLER AUSTIN AT HIS FIRST PUBLIC AUTOGRAPH SIGNING. THE HELMET IS AN OFFICIALLY LICENSED YANKEES MINI HELMET. A GREAT ROOKIE SIGNATURE! Certificate of Authenticity The helmet is accompanied by a Radtke Sports certificate of authenticity and matching Radtke Sports tamper-proof holograms on the helmet and certificate. The ball comes with a picture of Tyler signing as well.