Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 1032:
1933, Stratostat ”USSR 1”, 5k, 10k and 20k, complete set of three, large part of OG (redistributed on 5k and 20k), VF, C.v. $310, Est. $100-$150, Scott #C37-39
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