I was on the road with my dad, and he asked me if I'd heard of a tiny town called Bell Buckle, Tennessee. Because a little while ago, he went to pick up parts for a car project (or something like that), and while passing through the town, he spotted "a weird looking siren on top of the police station"
Well, I immediately did some research, and then I looked for photos, thinking it would be a federal model 5 or maybe a Darley, but it was norther of those sirens.
It's a silver Federal Model B horizontal siren. It is tested on the first Saturday of each month at noon IIRC. It is located at 37 Webb Rd. in Bell Buckle, TN
(photos courtesy of Waymarking.com)