Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1288:
1918, black overprint (type 10) on perforated 15k, 20k and 50k, all are postally used, mostly VF and rare group, ex-Dr. Zelonka, C.v. $390 for 15k and 50k, stamp of 20k has no price for used stamp, Bulat #1348-49, 1351
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