Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1311:
1918, black overprint (type 42) on perforated 5k, 10k/7k, 20k and 25k, full OG, LH/hinged, VF, expertized by J. Bulat and others, C.v. $345, Bulat #198/85
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