Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 900:
1977, 150th Anniversary of the Naval Academy, sunken die proof of engraved part of the design of (6k) in brown, artist Y. Bronfenbrener, engraver L. Mayorova, size 121×100 mm, printer’s markings at sides, printed on gummed paper, traces of hinges, VF and very rare, Est. $500-$600, Scott #4549
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