Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 395:
1903, 5c blue on bluish paper, horizontal imperforate pair with nice balanced margins, no gum as produced, NH, VF and scarce, only 200 imperf stamps were issued, R. Gratton certificate, Unitrade C.v. CAD$1,500, Scott #91a
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