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National Air Mail Week Covers of IndianaAlexandria, Indiana (Madison County), IN014%u2014May 19, 1938.No Backstamp. Signed in return address by Alexandria Postmaster Otto N. Hennefent. Addressee, Chester Knowlson was a noted Naval Philatelist. Unique address stamp on reverse for Alleen O. Whipple, who was a member of the Universal Ship Cancellation Society (USCS) and the American Naval Cancellation Society (ANCS).
