Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Russia And Soviet Union - 1937, Airplanes, group of seven registered covers from Vladivostok to USA sent in 1938, franked by various combination of singles, pairs and blocks of the issue, each one with appropriate transit and San Francisco arrival markings, VF and very attractive unit, Est. $1,200- $1,500, Scott #C69-75