Do nothing but sharpen it and use some blade oil on it to protect it. The handle is made up of leather discs that harden over time but are protected somewhat by the oils absorbed from your skin. ANY work other than what you did to read the makers mark will kill the collector value. The patina of use and provenance are essential to the value.
I've seen values drop as much as 90% because someone tried to restore them. Yours is in really good condition. Keep in mind, you can trace them by the serial number through military records if you want more info.
So is there a serial number somewhere on this knife?
KAS
Well if this knife had a serial number, it has worn off or it never had one. I did find some stuff about it via Google, though.
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