Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1215:
1918-20, inverted black surcharge “-50” on 2k green, imperforate complete pane of 25, surcharge is strongly shifted to the top left and forming eight pairs with and without inverted surcharge, very fresh, full OG, NH, VF ands scarce multiple, which is not listed in Scott, Est. $600-$800, Scott #36a, c var
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