Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 906:
1938, Second Trans-Atlantic Flight, 20k gray black, top and right margin imperforate single, full original gum with usual waves, NH, VF, expertized by Z. Mikulski, C.v. $950, Est. $500-$600, Scott #641a
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