I can read what is written on the coin. (From left to right) Side 1 says "Republica Mexicana" side 2 says "Estado Libre De San Luis Potosi" the date looks 1864 I can't find the coin in my resources there are similiar ones but I can't find one like this one. Side 2 has a pretty good wreath left on it and a 1/4 but I don't see the "real" under it. Side 1 looks like it might be a person seated with what is possibly arrows in one hand and some kind of club in the other. The person maybe wearing a crown or feathers. It looks in the lower left of side one there might be a cactus bearing thorns or a cross. It's possibly cooper. I hope someone can help me learn more and possibly post a photo of this coin in better condition so I can make out what it is suppose to look like. Thanks for any help!
Identified - moved to World Coins forum - Sap