Vintage 70s Diane deals Von Furstenberg Sparta Eyeglasses Tortoiseshell

This is a pair of vintage 1970s Sparta eyeglasses by Diane Von Furstenberg. The lens are very faintly colored so they may have been sunglasses originally. The name Diane deals Von Furstenberg is very faintly visible on one arm when viewed in clear light with a jeweler's loop. The lens appear to be prescription. There are two letters written in the corner of the left lens that may be the original owner's initials. The glasses are 5" wide and in very good to excellent vintage condition.