How about a pic Coily?? May be able to tell something about the style. In general though most old rusted out pocket knives will be unidentifiable as to age or maker. There are styles which are older or newer, and some styles that haven't changed much in two hundred years. There is also really no way to open them up since the rust usually corrodes them too badly, and if you could open them up the maker's name on the blade is usually gone from rust. The ONLY positive way to date a knife is by the maker's mark on the blade.