Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - China - SECOND AIR POST ISSUE : 1929, 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, mostly VF, Est. $300-$400, Sc. # C6-10