The oil treatment has brought out so much character in the wood. My fear was that any sort of oil treatment would cause the wood to swell and permanently tighten the pivot. Good to know I was wrong about that.
That's a well used blade! Mine were both dull out of the box, but I find them to be very easy to sharpen.
I let it soak in the oil for a day. I dropped the whole knife in the can of tung oil and let it set for a day in the sun near a window to keep the oil warm, pulled it out wiped it off and called it good. Every few years of so I give it a quick rub down with some mineral oil to keep it conditioned.
This knife also came dull, but the thin edge make it easy to sharpen,. The steel is soft enough to sharpen with a good file if need be. I use a Sharpmaker at home but when I am out and about I have used sand paper and files - this knife has been used hard and never pampered.