North German Postal District 1 Groschen in the horizontal strip of three in perfect condition, one stamp separated, to the protection was the perforation with hinge reinforced. cancelled the strip of three with 3 clean and central mounted extremely rarely postmarks" CONSTANTINOPEL D. R. P. A. 8 / 9 71 ". it should be in this kind a unique piece act. photo expertize Bothe BPP, Michel / Steuer 10.500.- regardless of of the rare unit! !