This Officially Licensed 2023 MLB All Star Game Jersey has been personally hand-signed by Mets Super Star 1st Baseman Pete Alonso. This item was signed in the presence of and witnessed by a representative of Major League Baseball. It comes with an individually numbered, tamper evident sticker from MLB 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.