I have delved in to this a little further.
Picture 1: Chrome plated Brass. It was toast anyway, so I hit it on the belt sander and this is what I found.
Picture 2: Another one that is beyond saving, so I hit it on the sander also, and it is not plate, but stainless.
Picture 3: I tapped out the dents, sanded it with 150,220,320,600,1500, and 2000. I polished it a little by hand, and it shined up real nice. I need to get a wheel to do a better polishing job. This is definitely usable.
Picture 4: All 4 have this same rusting issue on the mounting boss. Any suggestions what to do about it? I was thinking tape up the stainless and hit it with my glass beader, then sand, polish and clear it.