Autograph is authenticated by James Spence Authentication (JSA). Comes with JSA certificate of authenticity and matching sticker verified on their website.JSA is one of the world's leading authenticator of autographs. It is a "witness" COA, meaning a representative from JSA was present for the signing with him and witnessed him signing your item. Signed on 5/28/20 in Kansas City, MO. We are more than willing to help. The item "Tyrann Mathieu Autographed Kansas City Chiefs Super Bowl 54 LIV Mini Helmet JSA" is in sale since Saturday, May 30, 2020. This item is in the category "Sports Mem, Cards & Fan Shop\Autographs-Original\Football-NFL\Helmets". The seller is "bepowers33" and is located in Lee's Summit, Missouri. This item can be shipped to United States, Canada, United Kingdom, Denmark, Australia, Japan, France, Hong Kong, Netherlands, Spain, Germany, Israel, New Zealand, Singapore, Switzerland, Croatia, Brazil.