Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 172:
1927 (September 19), the Hague Air Post Conference, 10k and 15k x3, used on registered air mail cover from Moscow to Paris, all appropriate markings and arrival ”21-9-27” ds, mostly VF, Est. $100-$150, Sc. # C10-11
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