old enamel fixture cage light, huge vintage industrial lighting lamp

Vintage industrial light for factory or warehouse lighting. I don't think this is marked, though it looks like a old Benjamin fixture to us. Measures 12 1/2" long end to end, about 9" long over the cage.

The wiring all seems of be complete and in good shade, but there's quite a bit of wear to the white enamel, as shown in the photos. We think this would have originally held a glass shade over the light bulb, though it has none now.