Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 1382:
1897, imperforate plate proof of ½c in black, block of four from positions 64-65/74-75, printed on India and mounted on card, no gum as produced, NH, VF, Unitrade C.v. CAD$500++, Scott #66
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