Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1274:
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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