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The mark is so small it's impossible to photograph so I drew it as best as I could see it. It's on the jump ring to this charm. The ring also says "stg". I'm not sure if it's Mexican or not but I thought I would start here, just by the look of the mark. If you have any answers for me, I would sure appreciate it.

If it doesn't say Mexico 99.9% it's not from there. I usually see STG on American pieces.
The mark you drew reminds me of the one for Maisel's Trading Post, a little Kachina mark, but the devil doesn't seem like something they would make.

Great! That gives me something to look for. Appreciate it very much!