Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 1193:
1918, black overprint (type 37) on imperforate 1k, 3k and 7r, full OG, NH (both kop values) or hinged, VF, each one properly expertized, C.v. $342, Bulat #1952-53, 1955
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