This Official Major League Baseball has been personally hand-signed by BOTH Yankees Perfect Game hurler David Wells and the man behind the plate all game, Jorge Posada. David added the Inscription "PG 5-17-98".. This item was signed in the presence of and witnessed by a representative of James Spence Authentication. It comes with an individually numbered, tamper evident sticker from JSA which can be reviewed online to ensure authenticity. This process helps to ensure that the product purchased is authentic and eliminates any possibility of duplication or fraud.