Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 36:
1943, Air Training Plan, 7c deep blue, horizontal imperforate pair, large margins all around, full OG, NH, VF and scarce, only 50 pairs known, C.v. $850, Unitrade CAD$1,200, Scott #C8a
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