Federal Sign and Signal Model O - 6 volt -- 1L12H3

All information found online points to this being made sometime in the 1950s.

This would make a great restoration project. 

The replacement badges can be bought through sellers like: https://www.ebay.com/str/ihfiretruck 

****This item is AS IS. I do not know if it works because it needs to be rewired and cleaned up before putting into use.