Jim McMahon Chicago Bears Signed Sports Illustrated Sports Illustrated Date: 9/12/1988 The autograph was obtained in person at a private signing. This magazine is complete, intact, and in excellent condition unless otherwise noted. This item comes with a certificate of authenticity from Headline Sports. We stand by it's authenticity as the autograph is guaranteed to pass both PSA/DNA or JSA's strict authentication standards. Headline Sports carries the nation's largest inventory of back-issue Sports Illustrated magazines. | 
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