Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 841:
1978, Praha 78 International Philatelic Exhibition, sunken die proof of engraved part of the design of 6k in black brown, artist A. Kalashnikov, engraver V. Gubin, size 119x98mm, printer’s markings at sides, printed on gummed paper, traces of hinges, VF and very rare, Est. $400-$500, Scott #4693
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