Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Soviet Union - Zeppelin Flights - 1931 (July 25-27), North Pole Flight postcard and cover, franked by Zeppelin Ice-Breaker ''Malygin'' imperforate complete set of four, tied by Leningrad ''25.VII.31'' special ds, each one with red confirmation marking, Ice-Breaker ''27.VII.31'' drop handstamp, arranged on two pages from a Collection, VF, Sieger #120Ba, Bb, Scott #C26-29