This autographed jersey has been personally hand-signed by Edwin Diaz of the New York Mets. This autograph is certified by James Spence Authentication's (JSA) Witnessed Protection Program. That means that a JSA representative was present when this item was signed. It comes with the numbered hologram and matching Certificate of Authenticity.Custom on-field style jerseys are a more affordable option for autograph seekers. These jerseys do not have any brand name or tags and are made in the Philippines. They feature stitched on names and numbers and are made to look very similar to the on-field jerseys that the players wear. These custom jerseys are very commonly used in the memorabilia industry.