This is (what I believe to be) a reproduction of an AuLion WWI trench knife. Cast Brass handle with U.S. 1918 carved into the handle. One of the things that leads me to believe this isn't original is the way the 9 is carved into the handle, not connected. The blade is satin finished and is not sharp, .199" blade stock and 1.010" blade depth, hidden tang construction. The other thing that doesn't look correct is the stamp on the blade, just a little off. Anyone with better info than me, feel free to weigh in.
The reason we are still listing this, is because its still a cool thing. If you can't afford a real one, this one might just satisfy the itch.