Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 452:
1860-63, Queen Victoria, imperforated plate proofs of 5c in blue and 8½c in green, block of four on India paper, the last one with marginal imprint and mounted on card, no gum as produced, VF, Unitrade #10 P-11 P, C.v. CAD $490, Est. $150-$200, Sc. # 10-11
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