Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 640:
1898, Mt. Cook ½p and Kiwi 6p, two engraved imperforated plate proofs in black, blocks of four printed on wove paper without watermark, no gum as produced, NH, VF, Est. $300-$400, Sc. # 70, 78
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