Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 806:
1920, imperforate 10h and 15h, both in brown olive, perforated 15h in red brown, three proofs with six stars on the background, full/large part of OG, VF, Pofis #145, 147, Scott #66, 67
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