This strange siren questioned me for a while since I found it (sometime in late July). My best guess for this is an Ex-Seattle Decot, since they had quite a few of these early models (another example of this is in Darrington, WA, also possibly an Ex-Seattle) along with some Thunderbolts and Chryslers.
I don't know if still used. I still can't quite put my finger on it, though.
https://www.google.com/maps/@46.401602, ... authuser=0
Angle 2: https://www.google.com/maps/@46.4010396 ... authuser=0