This German company only produced this pistol for the German army during WWI.The production around 70,000 of the 7.65 FL Langenhan (It kind a resembles the 1900 Browning). If it wasn't cleaned properly and checked before firing, the bolt in back of the slide could fly back into the face of the shooter. (Imperial marked and kind of rare to find in this condition).The holster came with the pistol and marked 1918.
Thanks for looking,
Joe