Air Mail cover 1928-33 XU5 (7) comprising 1928 "Spirit of Canton" flight (unfranked), 1929 "Rignot-Arrachart" flight, 1929 Commander Liu "King Ma" Shanghai - Canton flight, 1929 abortive Canton - Yunnan flight, 1930 Canton - Wuchow military flight, 1932 von Gronau Round the World flight Shanghai - Manila, and 1933 registered flown XU5 from Peking to Canton bearing Air 15c. and N.W. Scientific Expedition 1c. to 10c. (cover signed Sven Hedin).