1920s Radial Wave Industrial Street Light With Dog Bone and Glazed Ceramic

This is a classic and early Radial Wave street lamp. The 20 Inch diameter green over white shade has a nice aged patina. The fixture features a large glazed brown ceramic and aluminum body. Its topped by distinctive Dog Bone outriggers that brings it to 18 inches tall.
The lamp is unsigned and I’m guessing on the 1920s age by look only. It uses a single E26 bulb… $1400