Im a bit late here but, your kyu is normal for the type 19 parade . original leather moisture guard, never had a seppa . The blade is fine, hasn't been touched, and still has the etched hamon, although its a bit scratched. Reason its loose is that under the pommel there is a square bolt attached to the threaded tang, its become loose, they all do. If your feeling brave, and the hilt is loose enough that there is a gap between the pommel, and brass domed washer, you can slowly and carefully work it off with a small screwdriver, the washer is only just cold peened so it pretty simple. tighten the nut and carefully re-cold peen the washer back on. Your scabbards in good condition.
