Examined this further this afternoon and determined it is not black paint but petrified cosmolineicon or tar of some sort so I'm cleaning that off. No pitting anywhere, just some light surface rust which I'm taking care of also. This bayonet would be considered crude compared to a Japaneseicon one. Heavy grinding marks all over it. I did find a possible light strike mark on the blade but inconclusive at best. Very remotely looks like a Chinese arsenal mark. It also appears heavier than a Japanese one, possibly because they didn't polish it to any great extent.