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: $400

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1924-25, definitive issue, worker 2r green and rose, typo printing on thinned grayish paper, three-side margin block of ten (5×2) with double impression, double control lines at bottom selvage, two horizontal invalidating perforation lines across the design, full OG, NH, VF, Est. $600-$800, Sc. #291 imp