
On the underside, it is marked EP for electroplated. Underneath that it has some model number: 1294 and the number eight underneath that. I believe this is a copper base with some kind of brass or gilt electroplating. Or this is some kind of polished brass thats electroplated. As you can see the inside of the box has a orange hue to it.
When I stick a magnet to it, it doesn't stick.