This autographed Majestic MLB replica CoolBase jersey has been personally hand-signed by Ronald Acuna Jr. of the Atlanta Braves. 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. It is also certified by USA Sports Marketing. It comes with the numbered hologram and matching Certificate of Authenticity.