Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 447:
1868, imperforate 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, Scott #28
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