Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 802:
1920, 1000h, 11 imperforate plate or trial color proofs in gray, black or violet, including one block of four (folded between stamps), printed on white chalk-surfaced, gray, creamy and pinkish ordinary paper, full OG or no gum as produced, VF, most with experts’ hs on reverse, Pofis #142, Scott #63
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