Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 763:
Description
1951, Russian Scientists, Stepan Krasheninnikov 40k violet, Pyotr Lebedev 40k blue and Konstantin Tsiolkovsky 40k gray black on blue paper, all have raster horizontal diamonds, full/large part of OG, NH (Tsiolkovsky) or hinged, mostly VF, Est. $800-$900, Scott #1572, 1574, 1582 var
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