Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2

Russian Air Post Stamps and Covers

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Start price: $100

Buyer's premium:

1938, Aviation Exhibition, 1r black, brown and buff, imperforate stamp from a souvenir sheet together with Papanin Expedition 30k olive brown, used on Mezhdunarodnaya Kniga registered philatelic exchange cover to London, tax stamp tied by 8-line cachet on reverse, blue crayon cross upon arrival, mostly VF, Est. $200-$250, Scott #C75a var