hi, I recently came across a 2 Japanese deba knifes and 2 what looks like petty knifes. They are in bad shape and I was wondering if anyone could identify them. I'd like to know if it would be worth it to restore them. The wood handles are splitting from the tang expanding from corrosion and needs to be replaced, the edge have chips in them and will need to be removed. I have a 7" deba, 6" deba, and a two 4 3/4 inch petty knifes, looks like pairing knifes. Any help would be greatly appreciated. Thanks.