I bought what seemingly is a mint 905swc body that is only 6 years old. While I have no idea the history of this camera it is like brand new, not a scratch on it except for the chrome trim. The chrome trim and I mean nearly every inch of it is covered in what looking like fine scratches giving the finish a dull look, and there is pitting and some sections with the chrome peeled off exposing what looks to be copper or brass underneath. What could have caused this and how badly can it continue to deteriorate?