I have come across an unusual item that I have no clue what it could be. It appears to be made of copper and has a diameter of just 10 mm. It is so light that it does not register any weight on a scale therefore it is under 1 gram. It has a thickness of about 1 mm. There are symbols on both sides as shown in the pictures attached. The U.S. dime is displayed to give an additional sense of size.
Does anyone have a clue what this unusual piece could be?
