This Autographed Pinstripe Cooperstown Collection Authentic Mitchell & Ness Jersey with the inscription of "HOF 7/21/91" has been Personally Signed by Fergie Jenkins of the Chicago Cubs. This item is 100% Authentic to include a Certificate of Authenticity (COA) / hologram by Beckett Authentication Services. The authenticity can be verified on Beckett Authentication Services website. This is a Large sized Jersey.