1929, Second Air Post issue, Curtiss Jenny over the Great Wall, 10c-90c, complete set of five with "Funny Propeller" cancellation and two Pioneer Flight covers by C.N.A.C. Nanking - Shanghai (1929) and Canton-Wuchow(1931), each one franked by two stamps, including No.C6, in addition air label Terra Asia, Shanghai, mostly VF, Est. $300-$400
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150.00

1931 (June 6), C.N.A.C. Pioneer Flight cover on line Tientsin - Beijing, then via Siberia to Europe, addressed to Great Britain, franked by seven stamps of the 2nd Peking printing, including three of $1 values, tied by special flight circular markings, bearing red Berlin Zentral Luftpostamt transit handstamp, vertical fold, still F/VF and rare franking, Est. $500-$600

250.00