Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 143:
1927 (September 1), Hague Air Post Congress, 10k and 15k in horizontal pairs used on FDC sent by connecting Pioneer Flight from Moscow to Berlin and then to Paris, arrival ”5.9.27” is on reverse, right stamp of 10c with pre-printing paper fold, mostly VF and scarce addressed FDC, Scott #C10-11
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