Hanging lamp - Coupe - etched polished glass

Large Art Deco ceiling light consisting of an etched cut-glass shade on a chrome fixture. The whole is in good condition; the inside of the ceiling plate has some scratches, these are not visible from the outside, the chrome has minor scratches and has been slightly discolored with age, and there are two tiny dents along the edge, see the last photo. The lamp has two large metal fittings. The diameter is 33 cm, the height is 20 cm. The exact age is unknown to me.