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: $300

Buyer's premium:

1981, Flag over Supreme Court, 20c black, dark blue and red, imperforate block of 20 (2×10), double paper variety on six stamps at bottom, red splice papers on front and reverse, full OG, NH, VF and very rare, C.v. $300 as ten vertical imperf pairs, Est. $600-$800, Scott #1894a, var