Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 476:
1868, imperforated plate proof of 12½c in blue, printed directly on card, nice margins, showing short entry at upper left scroll variety (position 67), no gum as produced, VF, ex-Brigham, Unitrade C.v. CAD$750 for proof w/o variety, Est. $450-$500, Sc. # 28
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