Time period of several old watch fobs

I’ve done a lot of googling to try to get the time period right on these fobs. I’m thinking 1 and 2 possibly Georgian, or Victorian; 3 and 4 Victorian; and 5 Edwardian. What do you all think?

None are gold or silver, I think all gold filled, but I wonder about #1. It was black around the frame and fob, and to my surprise cleaned up as you see. It has not been my experience that gold filled discolors to black, or that it cleans up like that. I thought it might be gilt silver, but does not test as silver. What metal do you think this is?

All help and comments appreciated. Thanks!