Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1313:
1918, black overprint on perforated 2k green and over black surcharge 10k on 7k light blue, both are postally used, first one – on a piece, VF, expertized by O. Peters and Dr. Seichter, C.v. $240, Bulat #2512-13
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