Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 3
Lot 1522:
1918, black overprints (type 47) on perforated 3k, 20k and 35k, all are postally used, mostly VF, ex-Dr. Zelonka and others, Bulat #2049, 2055 and 2057, C.v. $300 (first one priced with ”-”), Est. $250-$300
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