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Tom Lawrieyour son wants him depicted with Baltimore or Boston. If Baltimore, look for an N172 Old Judge card from 1888 or 1889. If Boston, your best bet is buying an 1895 Mayo card. Here is a link to a current Tucker Mayo up for auction:
http://www.19thcenturyonly.org/site/bid/bidplace.asp?itemid=893
Good luck,
Tom