Much appreciated, I was expecting a machine made gunto when I bought this and I thought the lack of serial or arsenal marking was strange. I figured I would get burned if I went for one of these but it still hurts a little. Didn't set me back very much so I think I will proceed with a plan of practicing my woodworking by making some basic mounts for this and using it for yardwork.
On the markings, the first reply mentioned the possibility of the marks having been made by a soldier. Not saying that happened here but is that a known phenomenon among WW2 issued swords? You see it on firearms from time to time but it's always been frowned upon.