Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Russia And Soviet Union - First and Pioneer Flights - 1928 (August 1-2), First Flight registered cover from Moscow to Novosibirsk, delivered with Dobroliot Company by aircraft Fokker C.IV bis M-5 on line Moscow - Kazan - Sverdlovsk - Kurgan - Omsk - Novosibirsk, franked by three values, including the Hague Postal Conference complete set of two, Novosibirsk ''2.8.28'' receiver on reverse, vertical fold, still F/VF and scarce, Est. $300-$350, Scott #C10-11