I would try to get this guys (he is dead)
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Simply because its worth about $50,000.
There is only about ten in the world and are owned by private collectors so the autograph is very hard to find. Also, don't let people fool you. People would send him letters to get him to sign and since he was illiterate he took 15 minutes to sign just one autograph. So he took the easy way out and let his wife sign them. His wifes are still pretty valuable though ranging from $500-$1000 The only real autographs he has signed are legal documents.