Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1300:
1918, black overprint (type 20) on perforated 2k-70k, and imperforate 1k and 3k, full/large part of OG, mostly VF, ex-Dr. Zelonka, C.v. $222, Bulat #172/14
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