Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1308:
1918, black overprints (type 25) on perforated 10k-3.50r and imperforate 1r, all are postally used, F/VF, ex-Dr. Zelonka, C.v. 422, stamp of 15k priced with ”-”, expertized by J. Bulat, Est. $400-$500,Bulat#1795/802
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