Auction 90, Session 2 - Worldwide Rare Stamps and Postal History
Lot 1156:
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. $600-$750, Sc. #36a, c
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