Type 30 Bayonet

[Jet Fixer]

Type 30 Bayonet
I picked up this bayonet the other day at a small antique store. While not in perfect condition, it does have some interesting markings, including the three notches in the grip, that I am hoping someone can help me with. These are the questions I have about it.

1) Any ideas on what the stamping on the grip means? They were not carved in to the handle. They appear to have been stamped mechanically. (WU 8(?)47)
2) Any idea what the stamping on the hilt beside the release button means? It appears to be a line over a circle beside the number 1.
3) There is red paint in the arsenal mark. I seem to remember that there was some significance to that, but don't remember what it is.
4) Approximate date of manufacture. I know it's prior to 1940, but that's about it.
5) Value estimate? They were asking $100. I paid less.

Information

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