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

United States - Modern Errors and Varieties

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Start price: $75

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1983, American Inventors, (20c) x4 multicolored, right sheet margin se-tenant block of four with black engraved color omitted, full OG, NH, VF, C.v. $275,Scott #2058b