History of Aviation, Rare Stamps and Postal History of the World, Part 1
Lot 387:
1857-59, HRH Prince Albert, two trial color imperf proofs of 6p in gray or black with vertical Specimen overprint in orange or carmine respectively, printed on India paper, one is card mounted, no gum as issued, VF, Unitrade #2TCv, ix, C.v. CAD$650, Est. $200- $300, Sc. #2
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