Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 218:
1888, Hamilton, imperforated plate proof of 30c in orange brown, bottom margin horizontal pair printed on stamp paper, tiny thins, no gum, F/VF appearance, C.v. $1,750, Est. $300-$400, Sc. # 217 P5
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