This Autographed Auto Graded Gem Mint 10! October 15; 1988 Athletics Vs Dodgers World Series Game 1 Ticket Stub with the inscription of "WS Gm 1 Walkoff HR; 88 WS Champs" has been Personally Signed by Kirk Gibson of the Los Angeles Dodgers. This item is 100% Authentic; it comes slabbed and authenticated by PSA/DNA. The authenticity can be verified on Professional Sports Authenticator website.