ESEE knives are carbon steel and the only exposed part that will rust is the actual edge because the rest is powder coated. Normal use usually prevents the rust. If I'm not using a knife a lot a simple wipe down with some CLP is what I do
once in a while.
ESEE is it's own company and not owned by S&W. USA made, blades made by Rowen in Idaho I believe, and no questions warranty.