Brad Johnson Signed Minnesota Vikings Jersey (JSA COA) Super Bowl XXXVII QBCustom on field style jersey. Everything is sewn on, size XL. Hand signed by Brad Johnson. The lot autograph(s) includes an official James Spence Authentication (JSA) hologram and matching COA for authenticity purposes. The signing of this item was witnessed by JSA. Authentication: JSA COA Custom on field style jerseys are a more affordable option for autograph seekers. These jerseys do not have any brand name or tags and are made in the Philippines.