Vintage roof mounted 12 volt siren unit mfg. By the "Auto-Matic-Alarm"
company of Chicago,ILL. The unit is cast aluminum and the name plate says
Mod# OC-9, S/N# 9006. It measures 10" high x 6 1/2" in Dia. It is mounted on
aluminum diamond plate and is pre-wired with a momentary push button switch.
It will operate off a 12 volt dry-cell electric fence battery. We can send a
audio recording by e-mail if requested.