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: $1,000

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1977, Venomous Snakes, 1k-12k, set of five sunken die proofs in brown or black brown, artist V. Kolganov, each one with printer’s angles, full OG, LH, VF and rare, Est. $1,500-$2,000 , Sc. #4626-30