Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 474:
1867, Beaver, imperforated trial color proof of 5c in black, block of four on India paper with enlarged margins at right and bottom and clear at left and top, no gum as issued, NH, F/VF and rare multiple, Unitrade #15 TCvii, C.v. CAD $3,200++, Est. $700-$800, Sc. # 15
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