Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 2

Canada

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Start price: $250

Buyer's premium:

1857, Pence issue, Prince Albert, imperforated 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 issued, VF, Unitrade #2TCvii, CAD$1,200++, Est. $400-$500, Sc. #2