Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1050:
1918-20, double black surcharge ”-50” on imperforate 2k green, three-side margin block of 20 (5×4) with additional single surcharges on bottom selvage, one natural paper inclusion on margin between stamps, full OG, NH, VF, C.v. $800 as hinged singles, Est. $300-$400, Scott #36b
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