Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1129:
1918, black overprint (type 29) on perforated 2k, 3k, 5k and 10k, imperforate 2k and 3k, nice and fresh, full OG, NH, LH or hinged, VF and scarce group, most with expert’s hs on reverse, ex-Dr. Zelonka, C.v. $175, while perforated 3k and 5k priced with ”-” in the Cat., Est. $400-$450, Bulat #1844/48, 1854-55
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