Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 3
Lot 1128:
1982, 60th Anniversary of the Soviet Union, 12 sunken die proofs of (10k) in various colors, complete or part of the engraved design for each of six values, approximate size 100×111-120mm, artist Y. Ryakhovsky, printer’s markings at sides, produced on gummed paper, previously hinged, VF and with high probability unique assemblage, Est. $4,000-$5,000, Scott #5091-96
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