Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 108:
1927 (September 27), Pioneer Flight registered cover from Moscow to Riga, franked by 4 stamps of the Hague Air Post Conference, one 10k with broken undercarriage variety, backstamped Moscow-Exp. date stamp, minor reversal foxing, mostly VF, Scott #C10-11
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