Smallville Cast Signed 12x12 Calendar - Welling, Rosenbaum, Mack, + JSA XX87049. Alison Mack (Jailbird - RARE Autograph). To remove the doubt if the item is real or fake since signatures are commonly forged to trick customers. This item has been provided with undeniable proof of the items authenticity. This way your investment is protected for life and will only increase in value. JSA has provided a Certificate of Authenticity (COA) to show the signature is 100% Real and Authentic. Please see pictures for items condition. Feel free to ask us any questions.