Dalvin Cook fans and memorabilia collectors will love this Dalvin Cook Minnesota Vikings Autographed Full Size Riddell Speed Replica Helmet - JSA Certified from Prime One Sports Online. This product has been authenticated by third party authenticator, JSA - Certificate of Authenticity (COA) and sticker included. Prime One Sports has conducted a private autograph signing with Minnesota Vikings legend, Dalvin Cook. Your order ships out same day. We are your go to online shop for authentic Minnesota Vikings signed collectibles.