Vintage square opaline sconce

Vintage opaline-shaped white opaline ceiling sconce. Beautiful dimension, 22x22cm. The back support is made of metal and requires a bayonet bulb, it shows traces of rust but invisible when the light is installed. Electricity tested. Weight 1 kg I try to describe in all and honesty the peculiarities (negative or positive) of this object, however do not hesitate to contact me if you want other details or photos that I could have ohim; I would be happy to respond as soon as possible.