Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 437:
1897, imperforate plate proofs of 1c in black and 6c in brown, vertical and horizontal pairs, printed on card mounted India paper, no gum as produced, VF, Unitrade C.v. CAD $700, Est. $150-$200, Scott #66, 71
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