Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 3
Lot 1458:
1918-20, black surcharge ”-50” on imperforated 2k green, complete pane of 25 with variety – inverted and shifted surcharge to the top left, forming five vertical pair with and without the surcharge, minor marginal creases not affecting stamps, full OG, NH, VF, C.v. 1,250 as hinged singles, Est. $350-$400, Sc. # 36a, c
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