Mike... Looks to be an original cartoon strip from the back of Jim's Topps card. As said it's one of a kind. The examples I have seen the artist did not sign the artwork. As hvc123 said it's probably not worth too much due to the fact that there's probably not a lot of his collectors and not a whole lot of individuals collecting the original artwork. Now, if you have a player that people collect, i.e. HOFer, then the value will definitely escalate.
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