Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 3
Lot 1397:
1918, black overprint (type 17) on perforated 2k green, neatly cancelled, fresh and VF, expertized by U.P.V. and others, ex-Dr. Zelonka, the stamp is priced with ”-”, Bulat #1640
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