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: $150

Buyer's premium:

1991, Bluebird, imperforate proof of 3c multicolored, right margin horizontal gutter block of four, full OG, NH, VF, C.v. $400 as two pairs, Scott #2478 P