Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1137:
1933, Stratostat ”USSR 1”, 5k, 10k and 20k, complete set of three, blocks of four slightly folded along horizontal perforation, CTO with full OG, mostly VF, C.v. $118++, Scott #C37-39
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