Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 3
Lot 1340:
1918-20, double black surcharge ”-50” on imperforate 2k green, three-side margin block of 20 (5×4) with additional ”single” surcharges at the bottom selvage, tiny natural paper inclusion, crease at bottom left and pinholes on margins, affecting altogether edges of 3 stamps, full OG, NH, mainly VF, C.v. $680 for 17 hinged singles, Scott #36b
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