Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 800:
1920, 125h, 16 imperforate plate or trial color proofs in gray, blue or violet on white ordinary, white chalk-surfaced, rose or yellow paper, one proof without value and one with mirrored design, full OG, NH, LH or no gum as produced, VF, seven proofs with experts’ signs, Pofis #140, Scott #61
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