Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 1174:
1918, black overprint (type 1) on perforate 1k- 50k, complete set of 13, full OG, NH or LH/hinged, mostly VF, expertized by J. Bulat and Dr. Seichter, ex-Dr. Zelonka, C.v. $473, Bulat #1058-70
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