Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 1070:
1918-20, double black surcharge ”-50” on 2k green, three-side margin imperforated block of 20 (5×4), full OG, NH or hinged (two top stamps), VF, C.v. $800 as hinged singles, Est. $250-$300, Scott #36b
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