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

Soviet Union Stamps of 1941-91

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Start price: $150

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1943, Tehran Conference, 3r indigo, blue and red, blue color significantly shifted to the left, bottom right corner sheet margin block of four, full OG, NH, VF, Est. $250-$300 , Sc. #908 var