Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 3
Lot 1453:
1918-20, double black surcharge ”-1r.” on perforated 3k red, bottom right corner sheet margin block of 10 (2×5), full OG, NH, VF, C.v. $500 as hinged singles, Est. $150-$200, Sc. # 23b
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