Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1134:
1918, black overprint (type 37) on imperforate 1k, 3k and 7r, full OG, NH (both kop values) or hinged, VF, each one with experts’ hs on reverse, C.v. $342, Est. $200-$250, Bulat #1952-53, 1955
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