Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 848:
1929 (March 9), Sov-Torg-Flot (Soviet Merchant Fleet) pre-printed envelope sent by registered mail from Ulaanbaatar to Germany, franked by Soyombo 50m buff and black, Leipzig ”27.3.29” arrival marking, F/VF, Est. $300-$350, Scott #41
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