This fob is a bit larger than a silver dollar. appears to be made of brass/copper alloy. my son found it while we were metal detecting in Waco TX. I have not been able to find much on this fob. however the circle A ginger ale Co. was started in Waco TX. but the founder joined the inventor of Dr. Pepper and become a partner in the Dr. Pepper Co. so I'm guessing it dates back to the mid to late 1800's.