Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Russia and Soviet Union - 1931, Zeppelin North Pole Flight, Polar Bear and Ice- Breaker ''Malygin'', 30k-2r, imperforate complete set of four, all with sheet margins, full OG, NH, VF, C.v. $217, Est. $150-$200 , Scott #C26-29