The clasp may well be far older than most of the rest of it, I think it's been made up.
Trick of the light, komo, there's nary a scuff. ;)
Old British 9ct gold clasp, then. ;)
I'd say!
It's certainly Bohemian. Some variation of Czechoslovakia on the base, possibly in French. The collars were often British.
Separate names with a comma.