Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 224:
1890, Clay, imperforated plate proof of 15c in indigo, left sheet margin horizontal pair printed on stamp paper without watermark, full original gum with some disturbance and ink offset on reverse, VF, C.v. $625, Est. $250-$300, Sc. # 227 P5
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