Indeed your spot on there Aurangzeb!
pre.ww1 Austria would be unlikley! woops!
If I had a German Trench knife, whether issue or a private purchase knife of that era, I would post it on Bernard Levines forum at bladeforums. Theres people there who would know. Many of them have been faked.
Bernard like facts & questians not opinion though, so his best dealt with in that manner.
Large clear pix. are also essential.
If a camera wont bring up the markings a scanner might.
Courier font? so the letters have Serifs then?
Spiral