WLT chavettas appear to be made of high carbon steel which was blued before the edge was ground. As a result, the edge can get some rust, once you start cutting damp tobacco. I suggest you blue it.
I usually blue my pocket knives using a lemon. It just so happens I have a bottle of gun blue in the garage. So I sanded the rust off the edge of mine and smeared a touch of gun blue on it. You just wipe it on, give it a minute, rinse, and dry. Blueing does a pretty darn good job against rust. Pictures don't pick up the irridescent coloring you get from blueing. In life, you get rainbows; whereas in pictures, it looks fairly black.
But it works:
I usually blue my pocket knives using a lemon. It just so happens I have a bottle of gun blue in the garage. So I sanded the rust off the edge of mine and smeared a touch of gun blue on it. You just wipe it on, give it a minute, rinse, and dry. Blueing does a pretty darn good job against rust. Pictures don't pick up the irridescent coloring you get from blueing. In life, you get rainbows; whereas in pictures, it looks fairly black.
But it works: