Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 801:
1940 (March 21), free-frank cover from Engels to Gorky with triangle marking ”Pochtovy Yaschik No.6. Engels ASSRNP”, bilingual ”Engels Kiosk 5” date stamp, Gorky ”26.3.40” arrival hs, mostly VF and scarce pre-WWII military mailing, Est. $250-$300
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