Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3
Lot 1252:
1957, Konstantin Tsiolkovsky, 40k dark blue and pale brown, complete sheet of 100 (10×10), representing all existing varieties of this stamp, folded once along vertical perforation (5th and 6th rows), full OG, NH, VF and scarce, Est. $150-$200 , Sc. #1991
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