Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1290:
1918, black overprint (type 4) on perforated 20k dark blue and carmine, vertical strip of five, representing stamps of types 4, 6 and 10 and two inverts of type 5, forming se- tenant tete-beche pair, perforation reinforced by hinges, which apparently was not necessary, full OG, VF and a beautiful piece, C.v. $175, Bulat#1159d
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