Caramel opaline glass hanging lamp

This pretty suspension comes straight out of the 70s with its lampshade with soft, rounded and wavy shapes in opaline glass of a beautiful caramel color (and white inside). The glass is in very good condition, neither cracked, nor missing, nor stained, nor even a scratch. The electrical cable was worn, I replaced it with a new brown cable. I tested it: it works. The socket, intended for a screw bulb with a small base, is made of plastic whose white lacquering has gaps. The glass rests on a metal "crosspiece" fixed on the socket. It is equipped with two small plastic parts (which has turned yellow), screwing on top of each other to enclose the wire so that the weight of the lampshade does not pull on the wire. I wonder if there is not a plastic part missing that had to close the high opening from above and thus keep the electrical part still. These are parts that are quite easily found in a lighting store. It also has a plastic fastener to attach the lamp to a piton in the ceiling. The lampshade is 21 cm high and about 18 cm in diameter at the widest. The cable is about 50 cm long. The whole weighs about 650 g.