Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 451:
1860-63, Queen Victoria, imperforated trial color proof of 2c in dark slate violet, block of four on India paper mounted on card, each stamp with red diagonal ”Specimen” overprint with serif lettering (type A), no gum as produced, VF, Unitrade #9 TCiii, C.v. CAD$200, Sc. # 9
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