Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 911:
1979, 400th Anniversary of Vilnius State University, sunken die proof of 4k in black, engraved part of the design, artist A. Zhvilis, engraver L. Mayorova, size 120x100mm, printer’s markings at sides, printed on gummed paper, traces of hinges, still VF and very rare, Est. $500-$600, Scott #4731
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