Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3

Soviet Union Stamps of 1924-40

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Start price: $100

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1939-43, definitive issue, aviator 30k dark blue, typo printing, two stamps of ”peace” and ”war” (cream paper, so-called Chelyabinsk print) issues in blocks of four, both have comb perforation, full OG, NH, VF, Est. $150-$200 , Sc. #736 var