Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 878:
1924, definitive issue, peasant, perforate (14½x15) and imperforate proofs of 6k in gray, printed on paper without watermark, the last one with sheet margin at left, full OG, NH, VF, Est. $150-$200, Scott #281
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