Lavender purple enamel painted copper Modernist vintage clip on earrings

Lavender purple enamel painted copper Modernist vintage clip on earrings. Fair wearable vintage condition with small signs of normal wear. Clip on vintage fastening. Stamped Pat 2733495 on the back of the clips. Surface of the purple enamel has small crazing and a few cracks. No chips. No missing pieces of enamel. Can be felt by touch. Earrings measure 1 inch tall and 3/4ths of an inch wide.