I have been doing some research about the old Colorado Springs CD Siren System.
I was only able to find one photo, which is a FS&S 500DHTT on the city auditorium:

I believe they were installed in 1959 (atleast according to old city documents).
So, this leads me to my final question: Does anyone know/remember any old locations of the sirens? If so, please DM me or put them in this thread.