Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 3
Lot 1269:
1940 (August 12), stationery cover 50k blue, sent by registered air mail from Moscow to Riga just 6 days after the admission of Latvian Republic to the Soviet Union, uprated by five stamps, return address is partly erased, still F/VF, Est. $150-$200, Sc. # 750, 769, 773
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