Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Russia And Soviet Union - Zeppelin Flights - 1931 (July 25-27), North Pole Flight card and cover from Leningrad to Ice-Breaker ''Malygin'', franked by specially issued imperforate complete set of four, 30k and 1r for card and 35k and 2r for cover, cancelled ''25.VII.31'' in Leningrad with Ice-Breaker ''27.VII.31'' receiver, German confirmation cachet and all appropriate markings, VF, Sieger #120Ba, Bb, Est. $300-$350, Scott #C26-29