Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 2041:
1918-20, double black surcharge ”-1r.” on imperforate 3k red, three-side margin block of 15, pinhole at top left corner, watermark Wavy Lines at left selvage, full OG, NH, VF, C.v. $450 as hinged singles, Scott #38b
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