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

Worldwide Air Post Stamps and Postal History - Poland

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Start price: $75

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1954, 3rd Congress of Polish Philatelists, imperforate souvenir sheet of 5zl dark blue, full OG, NH, VF, C.v. $275, Scott #C34 footnote