Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 453:
1860-63, Queen Victoria, imperforated plate proof of 10c in vermilion, imprint margin block of four on India paper mounted on card, green diagonal ”Specimen” overprints of types C-C/B-B, no gum as produced, VF, Unitrade #12P ii, i, C.v. CAD$300, Est. $100-$150, Sc. # 12
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