The Model 5 is pretty common.

I had lived in Upland, from 1985 to 1993. I saw that siren & thought they would just let it rot away.

I'm wondering about the price & db difference. Otherwise, why make 2 sirens so much alike?

Checking out this subject in online newspapers, I get: https://cdnc.ucr.edu/?a=d&d=SBS19560516.1.19&srpos=88&e=-------en--20--81--txt-txIN-%22civil+defense+sirens%22-------1 "Sirens to Wail In Test Alert Five civil defense, sirens throughout San Bernardino will wail warning, at noon...

This thread was discussed before:

https://www.airraidsirens.net/forums/vi ... hp?t=22467

https://www.airraidsirens.net/forums/vi ... hp?t=19242

https://www.google.com/maps/d/viewer?mi ... 99998&z=10

Happened on what sounds like a 7/10 port ratio siren, 4:40 in here:

https://youtu.be/b114xlklDVg

Gibson GA old Model 2:

https://goo.gl/maps/PLXYFZF9gJac6LMSA

Hi there! As an old time member here, welcome. It's interesting to see that there's a number of others with interests in outdoor sirens. Finding sirens: Noticing them when driving around is one way to find them. Some enthusiasts, and, some localities, have maps online of sirens in their area. Google...

I just did a search for R. J. Zievers Inc. on Google, and, this came up: https://books.google.com/books?id=Ak7RXMeyYeQC&pg=PA18-IA12&lpg=PA18-IA12&dq=R.+J.+Zievers+Inc.&source=bl&ots=Y66qJWnMRF&sig=ACfU3U0xa67JDIjZ66qqfn-Wt1gsHXbKbQ&hl=en&sa=X&ved=2ahUKEwj_veOPsoj...

"Oakland County has 275 outdoor warning sirens located throughout Oakland County."

https://www.oakgov.com/homelandsecurity ... ystem.aspx