Unusual Civil War era ring - an interesting relic

This is a very interesting Civil War era ring that was recovered from an area thought to have been a Civil War campsite along the banks of the South River in the Shenandoah Valley. It was recovered from private land with the owner's permission. This ring is unusual in that it has an oval area where a monogram would ordinarily go .. something not found very often on the battlefield or in camps. I am guessing that this is made out of brass, but the ground action in damp, acidic, soil conditions has been hard on it. The metal has turned dark, and it is badly pitted but very solid. The metal is non-magnetic. It measures a little over 3/4 of an inch ID.

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A Note About South River:

The South River saw its fair share of Civil War activity during both Stonewall Jackson's Valley Campaign, which started April 1862, right on through Sheridan's Expedition to Petersburg in 1865.

In fact, the very last battle in the Shenandoah Valley was fought along the South River in Waynesboro, Virginia on March 2, 1865, when Major Gen. Philip Sheridan along with two cavalry divisions numbering 2500 troops, encountered the last remnant of Lt. Gen. Jubal Early's Valley Army, numbering 1600 troops. The result was a Union victory. Of the 4100 troops engaged, there were 1800 casualties.