China air mail letter Shanghai 29.4.40 to Den Haag, sent through Hong Kong (censored), Bangkok, Naples (arrived May 10), London (end of air transport), by ship to Lisbon and then by train Berlin (censored) and returned Shanghai (without arrival stamp) through (probably) Moscow and Peking, 2 purple cancels NO SERVICE / RETURN SENDER and Réexpédié par voie ordinaire après/ avoir été retourné á Shanghai.