Antique "marbled" Unique Plastic Brooch

This brooch is very old, im pretty sure this is antique, you can tell this from the back; the pin, of the brooch is an old c-clasp. Marbled with white & creamed yellow tinge, it just depends on how the light catches it, its a beauty!! Cool sleek design. some wear on both sides see pictures, this is a cool old brooch, not quite sure the material, not tested, could be bakelite or a different kind of plastic material, very smooth to the touch.