Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 487:
1899, imperforated plate proof of 5c in blue, bottom right corner sheet margin block of four printed on India paper and mounted on card, no gum as produced, NH, VF, Unitrade #79P, C.v.CAD$800++, Est.$250-$300, Sc. # 79
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