Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1039:
1981, Mstislav Keldysh, Mathematician, President of the Academy of Sciences, sunken die stage proof of 4k in brown (engraved color only), artist G. Komlev, size 95x107mm, full OG, NH, VF and very rare, Est. $500-$600,Scott #4906
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