Well, I went to the place with the old SD-10 siren today in hope of finding an AR timer.
I was shocked to find a high current DPST switch, a relay can connected to the phone cables, a push button, 2 more switches, and a Federal motor starter.
No AR timer! And the wiring was complete, so it was not pulled out before.
I bought the motor starter/breaker/contactor assembly for $25.
Did I get ripped off? Help.