Two Questions on this one.

[TheBaron]

First off, the frosted metal is too thin to buff but how do I clean it. I can accept any damage I cannot fix to maintain the frosted metal but I do want to do what I can. Any suggestions (see first pic).

Second, I was originally told these scales were horn but I've never worked with or actually held horn so I'm not sure. There is a raised stamp on the inside of one scale with the letters "J.V"

The way these scales are cracking on the inside looks like something I've seen on plastics before. Do these look like horn, Does horn get cracks this way as well, any suggestions for fixing it?