Jack Clark Signed San Francisco Giants Gray Jersey Inscribed "Ripper" (JSA COA)This autographed custom on field style adult XL jersey has been personally hand signed by Jack Clark of the San Francisco Giants. When signing, Clark inscribed The Ripper along with his signature. This autograph is certified by James Spence Authentication (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