First of all I want to Thank you for all your Replies.
I will post more pictures when I get this cleaned up more. I ran a poweful Magnet over this button and it is not Magnetic in any form. And brass and Pewter have Magnetic qualties to them. It makes me think more this is either Gold Plated or something to that effect. Or has to be Copper since that is not Magnetic as well. Just confuses me because the Metal Detecter shows the metal is not copper. Whatever Metal this is the Metal Detector goes crazy when it you run the button under it!