Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 812:
Description
1930-31, Promotion of Osoaviakhim (Society for the Assistance of Defense, Aircraft and Chemical Construction), six unused postcards, 6k brown and 10k red, fresh and VF, Standard (2002) Cat. #28/190, Est. $200-$250
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