>>895640>>895642That might be sterling silver.
Many fisherman including myself wear Saint Andrew and Saint Peter as they are patrons of fishermen and they were themselves fishermen before being "called" to christ.
I don't believe in catholicism but the medallion charm is cool and I wear them because I'm superstitious about fishing because I'm retarded.
Saint Anthony is also considered a patron of fishermen amongst many other things.
Whoever had that charm would want you to wear it and go fishing with it.
Don't toss it. Keep it.