my former high school literally has this exact panel, except it's a 4247-2SU. I have a video of a fire drill with photos of the system at the end. The peripherals consist of second generation 4251-20s (plastic handle with metal button), 4255 heat detectors in storage and mechanical rooms (also the kitchen and home economics classroom), 4050s (operate on 6 V AC; black label) and a 4017-62 trouble bell
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Woah! Didn't know you were getting into much older simplex systems
my former high school literally has this exact panel, except it's a 4247-2SU. I have a video of a fire drill with photos of the system at the end.
The peripherals consist of second generation 4251-20s (plastic handle with metal button), 4255 heat detectors in storage and mechanical rooms (also the kitchen and home economics classroom), 4050s (operate on 6 V AC; black label) and a 4017-62 trouble bell
Also, since your panel has an auto-silence timer, it's full model is 4246-1 SU