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: $400

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1983, Large Refrigerated Transport Ship, two sunken die proofs, one with no value and inscription, the other one with top and bottom inscription and denomination of 15k, both are in dark brown, the last one with printer’s angles, approximate size 100x120mm, full OG with just trace of hinges, VF and rare, Est. $700-$800, Sc. #5160