This cap has been personally hand signed by Sandy Koufax and Nolan Ryan. It comes with a tamper-evident label and a certificate of authenticity from Beckett. 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. It is a limited edition of 202.