Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 317:
1860-63, Queen Victoria, imperforate plate proofs of 8½c in dark green and 12½c in black, blocks of four printed on India paper and mounted on cards, no gum as issued, VF, Unitrade #11Pi, 13P, C.v. CAD$540, Est. $120-$150, Scott #11, 13
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