Skoparette 4x scope, made by Voigtländer in Braunschweig, was one of the main models used by Bavarian snipers during WW1. The rear mount bears the logo of the Gebruder Merkel manufacturer in Suhl, Germany.
This is a Bavarian sniper scope made by Otto Bock K. & K. Hofl. in Berlin. Note the odd-looking single claw mount and the typical (1)-2-3-4 Bavarian-style meter dial.