Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 1168:
1918, inverted black overprints (type 1) on imperforate 1k-50k, representing 7 single stamps and 2 tete-beche pairs, full OG, NH or LH, VF, ex-Dr. Zelonka, C.v. $197, Bulat #834b/42a
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