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

Worldwide Air Post Stamps and Postal History - Czechoslovakia

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Start price: $100

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1929, two trial Airplane surcharges 14k (brown) and 24k (blue) on imperforate Hradcany 1000h violet, large part of OG, VF and scarce, Scott #C1-2