Keith Jackson Autographed/Signed Green Bay Packers Riddell Mini Helmet 11773 This is a Riddell mini helmet personally autographed by Keith Jackson. During his four seasons (1984-1987) the Sooners were 42-5-1 and won the 1985 National Championship. This was personally autographed at a private signing on May 1, 2014 and includes a picture from the signing as well as a certificate of authenticity from Denver Autographs.