Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 2
Lot 663:
1859, Cents issue, Queen Victoria, imperforated plate proof of 12½c in yellow green with carmine vertical Specimen overprint, well margined single printed on India paper, no gum as issued, VF, Unitrade #18Pi, C.v. CAD $300, Est. $100-$150 , Sc. #18
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