This nike alternate pitch black seattle mariners jersey has been personally hand-signed by ken griffey jr. with the added inscription "hof 99." it is officially licensed by the mlb and comes with an individually numbered, tamper-evident hologram from beckett 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.includes tamper-evident hologram to ensure authenticityofficially licensed this product is guaranteed authentic and includes a beckett certificate of authenticity and an accompanying tamper-evident beckett hologram.