I'll take a SWAG at it and suuggest that it may be part of a watch fob. By its reddish brown discoloration, I suspect that this artifact is made of brass.

-- 
Rich Green
Historic Archaeological Research
418 N. Main Street
Brownstown, IN 47220
Office: (812) 919-4122
Mobile: (765) 427-4082

On 12/2/2014 12:22 PM, Bob Skiles wrote:
> See artifact photo at:
>
> http://skiles.net/CampHollandArtifactFrancell.jpg
>
> This artifact was found by a visitor to the Camp Holland site in the 
> Sierra Vieja (Presidio Co. Texas) and is described as being very thin, 
> copper, and about the size of a silver dollar. This is the only photo 
> available. If you can identify it, please respond either directly to 
> the list or to Bob Mallouf at: [log in to unmask] ... as you may prefer.
>
> Muchas gracias,
> Bob Skiles
>