Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 3
Lot 1401:
Description
1918, two stamps with black overprints (Dr. Seichter types 9b and 9c) on 70k brown and orange, postal cancellations, F/VF and very rare, these overprint types are not listed in the Bulat Cat., ex-Dr. Seichter and Dr. Zelonka
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