The autograph was Authenticated by a JSA representative as part of their Witness. Both the JSA COA and helmet have matching serial numbers to guarantee authenticity. This helmet is a must for any Patrick Mahomes, Kansas City Chiefs, or NFL Collector.The item "Patrick Pat Mahomes Signed Kansas City Chiefs Speed Mini Helmet Witness JSA" is in sale since Wednesday, August 1, 2018. This item is in the category "Sports Mem, Cards & Fan Shop\Autographs-Original\Football-NFL\Helmets". The seller is "brasilmj" and is located in Santa Clara, California. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Brazil, Chile, Colombia, Costa rica, Dominican republic, Panama, Trinidad and tobago, Guatemala, El salvador, Honduras, Jamaica.