A brother-in-law gave me a knife with the word "Mexico" engraved on one side of the blade and some sort of design on the other side. I think it was more of a letter opener made for the tourist trade out of a mild steel.It's not a big knife and needs a scabbard but it is sharp.My question is it worth keeping as a tourista memento or take a file to the blade and get rid of the wording and design.and make a real knife out of it?