Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 3
Lot 1331:
1920, downward (inverted) overprint ”RUB” on 1k orange, vertical imperforate gutter pair, slight folds along the gutter, full OG, NH, VF and scarce, C.v. $200 as hinged singles, Scott #72a
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