Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Soviet Union - 1938-39, Balloons and Airplanes, Aviation Day, 5k-1r, 10k-1r, two complete sets on nine and five, some with sheet margins, full OG, NH, mostly VF, C.v. $340, Est. $200-$250 , Scott #678-86, C76-76D