Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 3
Lot 1460:
1918-20, double black surcharge ”-1r.” on imperforated 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, Est. $150-$200, Sc. # 38b
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