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.