This Autographed Warren Giles Onl Baseball has been Personally Signed by Notable Signatures Include: Willie Mays, Monte Irvin, Al Dark, Larry Jansen, Sal Maglie, Wes Westrum, Davey Williams, Hank Thompson & Daryl Spencer of the New York Giants. This item is 100% Authentic to include a Certificate of Authenticity (COA) / hologram by JSA. The authenticity can be verified on JSA website. Please knot the signature of Leo Durocher is a stamped signature as stated in the JSA LOA.