Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 173:
1920(c), Liberty, American Banknote 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, Est. $500-$600
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