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Marc S.I do not think there is enough reliable data out there to properly differentiate to a particular year when a baseball player signed an autograph.  
Can anyone out there propertly differentiate for me a Christy Mathewson signature from 1900 compared to 1901 compared to 1902?  You can't - it's not possible.  The same applies to nearly every Hall of Famer ever.  I just cannot even fathom how one could have any confidence in such tomfoolery.