Depending on where this was found or dug, this could even be a civil war era sash buckle for an officers crimson red sash. Nice piece there. It looks like it could be from the 1850’s or 1860’s.
Interesting you say that, CWF - the property is on Valley Pike several miles south of Martinsburg in the northern Shenandoah Valley. Property's likely to be filled with CW artifacts. Can't wait to hit it myself in the new year!
You might try looking online at some Sears and Roebuck catalogue jewelry pages for brooches ,circa 1900 -1920 to see what you may find that is close to yours .