Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1098:
1918, black or brown black (35k) litho error overprints (type 3A and 3B) on perforated and imperforate 1k-50k, including six stamps with inverted and two – with double overprints, full OG, NH (3) or LH/hinged, some expertized by J. Bulat or U.P.V., ex-Dr. Zelonka, C.v. $345, Est. #200 -$250, Bulat #601a/35a
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