Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 1046:
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, Scott #252, 263 x3, 265 x3
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