This is a large 1 & 1/2 by 1" boatshape button of a material I can't nail down without heat,and I hate to do that to old buttons. It does look very like gutta percha but it is two materials. The face is black; the body is brown. The inlaid head is white metal, not silver more like--oddly enough--aluminum. The "inlay" is not flush with the surface but extends a few millimeters. It's in very good condition.