I certainly don't have an opinion about the signature itself but I have been to a lot of postcard shows and have seen addressed, unused one cent postcards. It's possible that the postcard was already addressed yet unused and the note on the back was addressed to Hagenlocher to match the address already on the front. Note two different typewriter's for the note and address.
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Ballpark, Team & Player Postcards
Boston, Boston & Boston
T206 - 190/524
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