I am not too smart but the plating on a dime? Coins are stamped with dies, which means the image we see has been pressed into a planchet, the flat piece of combined metals. I have found some red Washington quarters and could see all of the detail I needed to recognize it as a quarter but the copper was leaching through. You may want to google how coins are made, this will give you an idea of what you are looking at provided you are thinking of the elements, the circulation wear and tear, the metals used to make the coins and anything else that may have put the coin in its current condition.