Conical glass suspension

Pretty suspension whose conical shade is made of thick crenellated glass with a chrome metal support and fabric wiring. It also has its suspension ring and a white plastic piton cover. I am not able to date it, maybe from the 80s but without certainty. It has some defects but fortunately not very visible: the top edge of the lampshade has been repaired, a shine has been filled by a kind of very hard translucent resin, I do not know what it is but it seems to me to hold correctly and it is not visible because placed under in the metal support. In addition, it lacked a screw on the three that allowed to hold the support on the lampshade. I found another screw, not identical but that works. I tested the lamp, it works. The lampshade measures 30 cm in diameter, 16 cm in height. The whole weighs nearly 2 kg.