Some costume jewelry earrings

These are some costume jewelry earrings from my collection. The first picture are Sarah Coventry 'Contessa' earclips. The second are georgeous unsigned clear rhinestone earclips I sold some time ago. The third are some cool '60s screw earrings and the forth pair are some weird enameld copper screw earrings I dont know anything about.
Does anyone have an idea about the forth pic? Thanks a lot!