This is an exceptionally nice brass bow light with virtually no signs of wear.
I think it is likely that it has never been installed since there are no screw head marks near the mounting holes
The glass lenses are excellent.
The light is 6" long, 4" wide, and 4" high including the flagpole socket which is 5/8" ID.
Comes with a Edison Mazda 120V 10 watt lamp in the socket with lead wires
Note the original Kilborn Sauer sticker
I think the light is likely from the '20s or '30s, but hard to say for sure