@IdiotIlluminati I have a couple of happi hangers from kaigai imports and I display them on my wall. I take them down to dust every few weeks and don't have them in direct sun and they seem to be doing fine.
@HollieB You should be able to reblacken it with a patina. Either liver of sulfer or Jack's black. Hit it with a polishing cloth to take it off the high spots. Then seal it with butchers wax. Most jewelry shops that do repairs should be able to do it.