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

Poland

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Start price: $75

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1919, Cavalryman, 20m gray green, perforation 11 1/2, top right corner sheet margin block of four with perforation freak due to foldover (imperf at right and top right), printed on vertically laid paper, full OG, NH, VF, Scott #148, var