Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 1177:
1918, black overprint (type 5) on 10k, 10k/7k and 20k, two vertical and one horizontal tete-beche pairs (one stamp has inverted overprint), all are postally used, VF and very scarce, all are properly expertized, ex-Dr. Zelonka, C.v. $290++, Bulat #1192-93b, 1196b
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