1937, Around the World Flight, folded letter sheet starting in Paris with special postmark 16. Oct. to Natal / Brazil, as Brazilian mail on 21. Oct. to USA, as US-mail 25. Oct. to Hong Kong and the last leg on 11.Nov. back to Paris, smaller traces of transportation, Muller cat. Nr. 248
6; Flugpost; FLUGPOST INTERNATIONAL; Frankreich
6; Airmail; INTERNATIONAL AIRMAIL; France