Bidspirit auction | Worldwide Air Post Stamps and
Worldwide Air Post Stamps and Postal History - Soviet Union - 1933, Stratostat ''USSR 1'', 5k, 10k and 20k, complete set of three, full OG, mainly LH, VF, C.v. $310, Scott #C37-39
Worldwide Air Post Stamps and Postal History - Soviet Union - 1933, Stratostat ''USSR 1'', 5k, 10k and 20k, complete set of three, full OG, mainly LH, VF, C.v. $310, Scott #C37-39