Looks like some kind of religious medal.

It doesn't look like silver to me. Silver comes out of the ground looking, well, silvery.

It's a St. George medal, he's the patron saint of the Coast Guard among other things. Saint medals are normally Catholic, or the Patron Saints recognized by Catholics I should say. However, many people wear or carry Saint medals for their work, or other purposes. ( St. Michael for police officers, soldiers, St. Christopher for travelers, etc. )

Many companies make these types of medals, if they're not marked there's not much telling who made them.

According to this, it's a watch fob:

https://www.rubylane.com/item/529490-8016/Saint-George-Slaying-Dragon-Creed-Sterling

While I agree with BBsGal, I did dig liberty half once that was nearly black, and was severely pitted.