Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 3
Lot 1392:
REMARKABLE SELECTION OF IMPERFORATES: 1918, 70 mint and used (30) stamps, including 17 inverted overprints, rare mint 50k, inverted overprint on 70k (not priced unused), scarce 5r and 10r, each one presented in two mint and one or two used stamps, clean unit, full/large part of OG or used, F/VF, ex-Dr. Zelonka, C.v. is over $1,350, Bulat #1244/57
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