Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 422:
1859, Queen Victoria, imperforate trial color proof of 12½c in bluish green, horizontal pair printed on India paper, no gum as issued, VF, Unitrade #18TC, C.v. CAD $600, Est. $150-$200, Scott #18
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