Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Soviet Union - Zeppelin Flights - 1930 (September 10-11), Moscow Return Flight postcard and cover, franked by Zeppelin stamps of 40k dark blue (perf 12½) and 80k carmine (perf 10½) together with definitive stamps, tied by Moscow special ds, two-line confirmation marking in violet, Friedrichshafen ''11.9.30'' receiver, mounted on pages from a Collection, VF, Sieger #85Aa, Bb, Scott #C12-13a