Vintage Marvella Clip On Earrings Black Ball Just Under 1/2"

Vintage Marvella Clip On Earrings Black Ball Just Under 1/2" These earrings measure about 0.5". Some glue visbible to rear. Light marks to front. Screw to tighten. Both screw/clip backs have some gold tone discoloration/silvering but one has more than the other. Preowned vintage earrings, sold as shown - I am unsure of material type(s) because of this. Pictures show different angles for you to review - while I attempt to note any defects, some tarnish/signs of wear may be visible that are not otherwise stated. Earrings are tested and photographed on a thin/smooth earring stand (not included) to show that the clips are in working order. If you have any questions please feel free to drop me a message.