Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 1175:
1918, black overprint (type 1) on imperforate 1k-70k, set of six, full OG, NH (low values) or LH, VF, expertized by J. Bulat, A. Epstein and others, C.v. $255, Bulat #1071-76
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