Vintage Marvella Mid Century Modern Large Silver Oval Clip On Earrings

This rare set of clip-on earrings by Marvella most likely dates to the 1960s-1970s. Signed on the back, they are a silver tone metal, hollow on the inside. In very good condition with some minor scratching (not really visible except under magnification, see photos) consistent with their age. They measure about 1" tall and 1/2" wide. Simple, elegant, and classic!