This player-worn shirt was personally hand signed by Pete Alonso during the 2019 MLB season with the inscriptions "PLAYER WORN 2019; ROY SEASON." It was obtained under the auspices of the Major League Baseball Authentication Program and can be verified by its numbered hologram at MLB.com. It also comes with an individually numbered, tamper-evident hologram from Fanatics Authentic. To ensure authenticity, the hologram can be reviewed online. This process helps to ensure that the product purchased is authentic and eliminates any possibility of duplication or fraud.