Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3
Lot 1462:
1918, black overprint (type 5) on perforated 10k, 10k/7k and on 15k, three vertical tete-beche pairs, top stamp with inverted overprint, full OG, LH, VF, expertized by J. Bulat and Dr. Seichter, C.v. $365 as single stamps, Est. $250-$300 , Bulat #1192a, 1193b, 1195b
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