Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 454:
1860-63, Queen Victoria, two imperforated plate proofs of 12½c in black, blocks of four printed on India paper and mounted on cards, one has imprint on left margin and red diagonal ”Specimen” overprint, types B-B/C-C, no gum as issued, VF, Unitrade #13P, Pi, ii, C.v. CAD$540, Est. $150-$200, Sc. # 13
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