Those are special. I found one at a picket where the CSA were guarding a crossing. It is small and my wife suggested that maybe when the soldier went off to war they traded rings. Ain't got a clue but there's a lot of love still in the one I found. It is gold plated brass but the soldier or someone "spooned" out a dime or something and covered it in silver, I've got to find my camera...d2