Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1093:
1940 (August 12), stationery cover 50k blue, sent by registered air mail from Moscow to Riga just 6 days after occupation of Latvia by Soviet Union, uprated by five stamps, return address is partly erased, still F/VF, Est. $150-$200, Scott #750, 769, 773
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