Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 443:
1857, Queen Victoria, imperforate trial color proof of ½p in black with vertical carmine Specimen overprint, horizontal pair printed on India paper and mounted on card, penciled positions 43-44 on reverse, no gum as produced, VF, Unitrade #8TCii, C.v. CAD$600, Scott #8
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