The Siren Board

I have spotted a weird siren on top of the Rutland, Massachusetts Fire Department, and I don't know what it is. What really makes me not know what it is is the parts in between the norns & the motor cover, as I cannot tell if there is either the Stator & Rotor, or just some supports of some sort. My Guess is what it could be is a Federal Electric Type B, Sterling Little Giant, or a Darley Horizontal Siren of some sort.