This button is so special. At 2 1/4" it makes a statement. Also it is in amazing condition for the 1930's era. It is a metal base with a circular outer ring of wood grained celluloid. The large 1 3/8" faceted center reflects the light with a blueish oil slick tinge in the black. On the four sides of the central are Art Deco triangular designs. Wonderful.