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 registered postcard franked by Ice-Breaker ''Malygin'' imperforate stamps of 30k and 1r, tied by Leningrad (25.VII) and bearing Ice-Breaker (27.VII) special date stamps, red confirmation cachet and all appropriate markings, VF, Sieger #120Ba, Scott #C26, C28