Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1002:
1938, Papanin’s Expedition, 50k blue, bottom sheet margin imperforate block of four, insignificant facial abrasion mentioned just for a record, tiny soiling on full OG, hinged on top stamps and margin, bottom pair is NH, mostly VF and very rare multiple, C.v. $14,200 as two pairs, Scott #646a
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