Description:Dennis Martinez autographed July 28, 1991 Perfect Game Used Baseball (Martinez LOA). Lightly soiled game used W. White National League baseball as used in Dennis Martinez's Perfect Game with the Montreal Expos against the Los Angeles Dodgers. It was the 13th such occurrence in MLB history and the first to be accomplished by a pitcher born outside of the United States. The ball is inscribed on multiple panels, "Perfect Game 07/28/91 Game Ball used during Expos vs. Dodgers Thrown by" and then signed by Dennis Martinez. PSA/DNA sticker affixed (autograph) with letter of provenance signed by Martinez and certificate of provenance from Geddy Lee: Ball: EX, Signature: NM