Dalvin Cook Signed Minnesota Vikings Nike NFL Replica Game Jersey (Beckett) R.B.This autographed Nike NFL replica Game (adult XL) jersey has been personally hand signed by Dalvin Cook of the Minnesota Vikings. This autograph is certified by Beckett Authentication Services (BAS) Witness Certification. That means that a Beckett representative was present when this item was signed. It comes with the numbered authentication hologram with a QR code that verifies the authentication on the Beckett website.