FedSigs first chrome speaker looked similar--rear housing of their electromechanical sirens with a grill--but that's not a federal base. In fact it doesn't resemble a Sireno or Sterling either. Color me stumped. Nice early example, whatever it is.
Got it! No dents, but chrome needs chroming or paint. Definitely different, and nice shape.. No, I have not opened it up yet. Looks legit, not home made.