Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 254:
Description
1932-37, Sealing Fleet, 25c bluish gray, top sheet margin imperforate pair, and imperforate plate proof of 25c in black, horizontal pair printed on wove paper without watermark, full OG or no gum as issued, NH, VF, Unitrade C.v. CAD$450 plus NSSC 191g, C.v. US$460as singles, Est. $300-$350, Scott #197, a
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