Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 3
Lot 1208:
1981, Academician Mstislav V. Keldysh, die proof of engraved part of the design of 4k in brown, artist G. Komlev, printer’s markings at sides, size 96x110mm, no gum, VF and very rare, Est.$400-$500, Sc. # 4906
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