I couldn't find any good pics of civil war tourniquets showing the buckles and in what I could see didn't see any exactly like yours Looking at the picture of yours again I'm not 100% sure it's civil war. Because of the way it's made it looks like it might be late 1800's or very early 1900's. Have you found any later items in the area. In the early 1900's the army did manuvers in VA and followed the routes of some of the civil war troops. At times we find Span- Am period stuff in the civil war camps around here.