This may be as early as the 20's. It has porcelain socket inside but no bulb. I unsnapped the bottom door on the cage to get the globe out to clean it up but it's stuck,probably to a gasket,so it's going as it came. Will need rewiring. The thread on top is 3/4 pipe and when piped that is also the hanger. Would look great outside a garage for a commercial look. The globe looks good,no cracks or breaks. It's about 9 1/2" overall length,5 3/4" diameter so it should barely fit a flatrate box. $85 plus 13.65 shipping check or paypal. Please PM me if interested.
Looks like an Explosion Proof fixture. Ones I have worked with the glass globe UNSCREWS. Like a jar. Dan