Vintage Ellen Designs clip on earrings, black and cream enamel

This listing is for a pair of vintage Ellen designs earrings. They are clip on with black and cream enamel divided in half by a thin line of gold. The finishings on the back are gold plated. There is a hallmark stamp on each of the clips. As you can see in the pictures there is some yellow discoloration on the cream enamel of one earring. Each earring is a circle with a diameter of a little less than 1 inch.