This baseball has been hand signed by George Steinbrenner, Pat Kelly, Frank Howard, Andy Stankiewicz and J.T. Snow. It comes with a tamper-evident label and a certificate of authenticity from James Spence Authentication. This process helps to ensure that the product purchased is authentic and eliminates any possibility of duplication or fraud. SportsMemorabilia.com firmly stands behind every product offered on our site with a lifetime authenticity guarantee that each signature is 100% authentic.