Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 453:
1898, Mt. Cook ½p and Kiwi 6p, two engraved plate proofs in black, imperforated pairs on wove paper without watermark, no gum as produced, NH, VF, Est. $150-$200, Scott #70, 78
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