Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1274:
Description
1918, two inverted black overprints (types 3a and 3b) on perforated 1k orange, blocks of four, full OG, NH or LH (top stamps, VF, first one expertized by Dr. Seichter, ex- Dr. Zelonka, C.v. $160++,Bulat#601a, 613a
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