What can you tell me about this Knife?

Found this among the belongings of my recently deceased Grandma-in-law and I’m hoping to find out some info about it.

Background: She was born and raised in Okinawa until she met my future Grandpa-in-law while he was stationed there in the late 60’s.

I’m hoping to learn anything about the type of knife it is, what it’s used for, who made it (and when) and also what is the potential value (if any) of the knife so I know if it needs to be preserved or if I can sharpen it up and toss it in my blade drawer.

I really appreciate any help you handsome, knowledgeable and handsome folks can provide. (This is me kissing ass in exchange for help).