I can't even begin to pretend that I know what this is or was. All I know is it's metal and has just the right amount of rust here and there.
If I had to guess, I'd say it was for something electrical, because there's this thing attached to it that holds two ceramic insulators.
It bears the number 102 in some sort of enamel paint...
A close-up of what I'm calling the "insulators"....dirt and all.