This Dr. W. Gérard B3x sniper scope has an uncommon transitional straight lined mount. These mounts were completely offeset to allow the sniper to aim with the regular bore. They were replaced by half deported mounts on most of sniper scopes pretty early in the war.
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Emil Busch A-G Rathenow Visar 2,75x was one of the most used sniper scopes during WWI. This one was mounted on the rifle n° 5756 d.
Another rareWW1 sniper scope made by R. Fuess Berlin-Steglitz. Green paint was pretty uncommon 14-18 sniper scopes. Only a few manufacturers used this finish on their scopes, mostly late war.
Here is one of the “classic” Prussian sniper scopes used during World War I. This 3x scope was made by R.Fuess in Berlin. Scopes made by R.Fuess were sometimes painted green.