Carl Eller Minnesota Vikings Authentic NFL Throwback purple Jersey. This item comes with a Certificate of Authenticity with matching tamper-proof holograms from Athletic Promotional Events, guaranteeing the authenticity of this hand-signed autograph. Athletic Promotional Events, Inc. stakes its reputation on every item it sells, and authenticity is their number one priority. Every signature has been witnessed by a company representative and is marked with their unique hologram. Each and every autograph is guaranteed for life to be authentic.