ko-wakizashi id

would you all take a look at this maybe zoom in, do you see anything, is there some kinda writing on it, looks like something but dont no what thanks what you all think

File marks

The only marks I can see are the file marks.

looks like

looks like some kinda writing not chiseled in, the first looks like a indented o, the second one looks like a three prong y, the last looks like a n or something, it could be the way it wore, but looks like something, look at the bright spot right of the hole,on top thanks