Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 441:
1857, Prince Albert, imperforate trial color proof of 6p in dark gray with carmine vertical Specimen overprint, top sheet margin block of four, printed on India paper mounted on card, no gum as produced, VF, Unitrade #2TCvii, CAD$1,200++, Scott #2
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