Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 475:
1950’s, Liberty’s Head, Canadian Bank Note Co. imperforate proofs of 2(c) in black, blue or green, four horizontal pairs on colored (3) or white paper, each one inscribed ”Experiment” at top and ”Specimen” at bottom, no gum as issued or full OG (green on white), NH, VF and very scarce group produced for testing purposes, Est. $300- $350
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