September 12 1988 Signed Copy Of Sports Illustrated ( JIM MCMAHON )

I worked an estate auction of a big sports enthusiast and collector. I ended up with this magazine in a lot I purchased. I've had it for a few years and forgot all about it!! Autograph is NOT authenticated but it is signed to the same name as the estates name. His whole house was sports!!! I have absolutely no doubt it's real as he had MANY photos with himself and various sports stars.