Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 315:
1860, Queen Victoria, imperforate plate proof of 5c yellow green, printed on India paper and mounted on card, bottom sheet margin block of six (3×2), red vertical overprint ”Specimen.”, types D-B-C, no gum as produced, VF, Unitrade #8Pii, iii, iv, C.v. CAD$900, Est. $300-$350, Scott #8
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