I want to redo this and some of my others when I have a way of making good rivets that allow functioning gears and precise placement. However, I like this one using a Triumph pin my husband gave me when I had my Bonneville some years ago. The magnifying glass is free enough to be used on things if needed and focuses on the Coin. It swings a bit more than I would like, I would fix that if I redid this one with the riveting. All connections are copper, as is the back gear. The others are brass and bronze. The pin is silver. Not sure what the stone is. I also like triumph cars, so the gear on the left serves duel purposes for me. Setting the gears so they fit together and spin was a challenge lacking the rivets, they are held motionless for the picture.