Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1

Worldwide Air Post Stamps and Postal History - RSFSR and Soviet Union - Pioneer Flight

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Start price: $150

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1937 (June 3), registered cover from Bryansk to Czechoslovakia (Carpatho-Ukraine), franked by 7 stamps (two on reverse), including Construction of Airship 1r green and Airship over the Dnieper Dam engraved 15k gray in block of four, Mukachevo ”8.6.37” arrival marking, VF and scarce franking and destination, Est. $300-$400, Scott #C24, C25