Seeking info on this antique tanto

[ThomzThom]

 

Hello, I’m hoping someone might be able to tell me some information about this tanto.
 

My grandfather brought it back from Korea, (with written permission), during WWII. He never spoke about it but it was passed on to my father when his father died. Neither of us know anything about it.
 

I removed the tsuka to check for an inscription, but unfortunately I don’t see anything. Just the writing on the end of the tsuka itself. Can anyone translate that? Also, one of the small gold-colored pieces has four lines scratched into it. What could that signify?

 

Any information you could provide would be helpful, thanks!

 

[Ken-Hawaii]

Welcome aboard, Thom. From the thickness of the blade, my first opinion is that you have a yoroi-doshi, in what looks to be moderm mounts.

 

In the future, please show the completely bare blade, rather than everything else. The sugata (shape) tells the age, which leads to other info about the blade. The tosogu (everything else) was probably changed many times over, with way we change our clothes (at lest pre-pandemic), & tells nothing about the blade, itself. The markings are probably used to match up the various pieces.