Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 963:
1957, Konstantin Tsiolkovsky, 40k light blue (instead of dark blue) and brown, color variety, bottom right corner margin block of four, in addition a single with black ”First Sputnik” overprint, representing the same color variety, full OG, NH, VF and scarce, a common block and a single are is included, Est. $120-$150, Scott #1991 var
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