Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 801:
1920, 500h, six imperforate plate proofs in gray on white, blue gray, creamy or orange paper, typo or litho printing, full OG (1), NH or LH (1), VF, experts’ guarantees on reverse, Pofis #141, Scott #62
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