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

Soviet Union - Large Die Proofs

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Start price: $250

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1978, Georg Ots, Estonian Singer, 4k in slate blue (issued color), artists P. Kukhtein and V. Trager, engraver V. Smirnov, printer’s markings at four sides, size 90x120mm, no gum as issued, VF, Est. $400-$500 , Sc. #4818