Here is an autographed, 8 x 10 photo of the former, San Diego Chargers and Baltimore Colts tight end - John Mackey - that includes a COA from Envoy Collectables that verifies the Mackey signature as authentic.  This photo has been signed in blue ink with signature being crisp and clear with photo having light wear.  Please use the zoom feature to determine if condition meets your requirements.  Thanks - Howie