It is an original reproduction from old gold imitation castings. In France, where art nouveaux was called art nouveaux, but I am not where.
I have taken two shots to show the very careful execution of the cast.
The chandelier is 20 cm / 7.87 inches high, the base measures approx. 10 cm / 3.93 inch x 4 cm / 1.57 inch The weight of approx. 300 g / 0.66 lbs corresponds to that of a bronze cast chandelier.