That’s no Darley, that’s something called a Weltex. Lots of them in Oregon, in Rickreall, Tangent(modified), Brownsville, Canyonville, Camas Valley, Gardiner and John Day. Here are some photos of the one in Rickreall:
https://imgur.com/gallery/F4a1iM6
Siren enthusiast of about three to four years, one of the few siren YouTubers of Oregon
Owner of a partially screwed 1969 STH-10 and a few other small sirens
Oregon State Siren Map V. 2
Email(best contact method):
[email protected]