Civil War in Del Rio, TX???

[rb24]

I found this thing near Del Rio, Texas. I dug it out from the base of a Mesquite tree. I'm not a history major, but I've done my homework. I think it belongs to Company D, 14th Infantry, stationed at Fort Clark, Texas. Circa 1860-1861 as Company D was en rout from New Mexico to Fort Clark, TX, then to Fort Pickens, Fl.
Or...I have no idea what this thing is. Can anyone peg this button. It measures 1 inch across, and appears to be made of copper. Thanks, rb24

 

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[Burdie]

Very nice find. Thanks for posting.

 

[trk5capt]

Collar Disc from WWI. Should have a threaded stem on the back. Nice condition and find
Don

Co.D 14th Cav. trk5capt...