Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 3
Lot 1421:
1918, black overprint (type 56) on perforated 2k-50k, imperforate 3k (pair) and 1r, full OG, LH or hinged, F/VF, properly expertized, C.v. $426, Bulat #2171/87
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