BAKER MAYFIELD AUTOGRAPHED OKLAHOMA SPEED MINI HELMET. Baker Mayfield, former Heisman Trophy winning quarterback for the Sooners, has signed this OU Riddell Speed mini helmet at a private signing. This item comes with a certificate of authenticity (COA) from JSA. James Spence Authentication and was.Of one of their representatives. You will receive a serial numbered COA along with a matching serial numbered sticker on the helmet. The authenticity can be verified online by entering the serial number. College Authentics is committed to your complete satisfaction. College Authentics takes authenticity very seriously. We understand how important it is for you to know that the item you are purchasing is 100% authentic. That's why we guarantee the authenticity of every item we sell and will always provide a certificate of authenticity with every item. The signed items we sell come exclusively from paid athlete appearances and signings in which we have participated, and from only the top, most reputable suppliers in the business, including Steiner Sports, Schwartz Sports, Mounted Memories, Tri-Star Productions, and UDA (Upper Deck Authenticated). The item "BAKER MAYFIELD AUTOGRAPHED SIGNED OU OKLAHOMA SOONERS SPEED MINI HELMET JSA" is in sale since Wednesday, April 04, 2018. This item is in the category "Sports Mem, Cards & Fan Shop\Autographs-Original\College-NCAA\Football\Helmets". The seller is "college_authentics" and is located in College Authentics. 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.