Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Soviet Union - 1924-26, two registered covers franked by ''Fokker F111'' surcharged issues with additional franking, first one from Moscow to New York via Berlin, the other one from Kharkov to London via Moscow and Berlin, all appropriate markings and arrival ds, F/VF, each one with I. Kirzhner certificate, Est. $100-$150, Sc. #C6-9