Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1139:
1918, black overprints (type 47) on perforate 3k, 20k and 35k, all are postally used, mostly VF, ex-Dr. Zelonka and A. Epstein, C.v. $300, plus 3k, which is priced with ”-”, Est. $300-$350, Bulat #2049, 2055, 2057
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