Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 1069:
1918-20, inverted black surcharge ”-50” on 2k green, imperforated complete pane of 25, surcharge is strongly shifted to the top left and forming eight pairs with and without surcharge, very fresh, full OG, NH, VF and scarce multiple, Est. $700-$800, Scott #36a, c
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