Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 166:
1941 (February 10), First Flight Moscow – Minsk – Vilnius – Kaunas – Riga, registered cover franked by two Balloon stamps of 50k and 80k, addressed to Riga, ”11.2.41” arrival ds on reverse, VF, Est. $200-$250,Scott #684-85
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