Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 1161:
1918, error black or brown black (35k) overprints (type 3) on perforated and imperforated 1k-50k, including six stamps with inverted overprint and two – with double overprint, full OG, NH (3) or LH/hinged, some expertized by J. Bulat or U.P.V., ex-Dr. Zelonka, C.v. $345, Bulat #601a/35a
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