Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Russia and Soviet Union - 1937, Aviation Exhibition, 10k-1r, complete set of seven used together with aviator 30k blue on registered flown cover from Moscow to Switzerland, sent in 1941, Moscow-9 (Main Telegraph Office) ''28.3.41'' date stamps, black boxed ''Received in Moscow in damaged condition'' marking in French, Zurich ''31.III.41'' receiver, no significant defects, F/VF, Est. $250-$300, Scott #C69-75