Holophane square wall lamp XL glass design 60s

Wall or ceiling light. Holophane brand. Work from the 60s/70s. Thick molded glass mounted on a satin black metal structure. Very good overall condition. Note some common traces of use on the back of the metal frame and tiny rust spots almost imperceptible in places on the glass (see photos and zoom). Holophane brand present in hollow inside the metal structure and in relief on the outer edge of the glass (see photos and zoom). The maximum dimensions of the glass are 33 cm X 33 cm; those of the metal structure are 30.5 cm X 30.5 cm. Works with three small-base screw bulbs not supplied. Note that the perfectly functional electrical system is not original.