Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 423:
1859, Queen Victoria, two imperforate trial color proofs of 12½c in black, first one with vertical overprint SPECIMEN in carmine at left, printed on India paper, no gum as issued, VF and scarce, Unitrade #18TCx, ix, C.v. CAD $1,300, Est. $300-$400, Scott #18
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