Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 83:
SECOND AIR POST ISSUE : 1931 (April 14), First Flight Beijing – Nanking registered cover, franked by eight stamps, including the second air post set of 10c-90c, Nanking arrival and all appropriate markings are alongside, minor conveyance flaws, still F/VF and scarce franking, Est. $300-$400, Sc. # 251 x2, 255, C6-10
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