This siren is located in Proctor, MN near the AmericInn Duluth south (Proctor is very close to Duluth, MN). I know that Duluth has some Whelen sirens so I'm guessing it's part of the Duluth siren system.
According to this MN siren map, the siren is a Whelen vortex.
Another way to tell is look at the controls. If there is one box, it's a Vortex. If there's a box with another section on bottom, it's a 4004. Also the rotator motor will either be round or square. Round = 4004, vice versa.
Owner of a Federal Signal STH-10, 2 Federal Signal Model A's, 5 Federal Signal Model D's, Federal Signal RX, Federal Signal Model L, Streling F2, ASC T-121, Federal 3T22A and Federal Signal 3T22B