I’m betting from the 4251-20 pull, at one time Simplex serviced the church, and replaced a pull station that stopped working while doing so.
A good example of the type of system you mentioned would have to be the K-8 school I went to for kindergarten. It was built in 1974 and has a good chunk of its’ original system intact, but also many newer devices. The system is a Simplex 4010 installed maybe a little over 10 years ago, tied into the original Simplex 4208 panel. The 4010 is used for the duct detectors, system monitoring, the modular building and I believe signal circuits. The 4208 is used for existing pull stations and heat sensors. Prior to the 4010, they had a 4004 panel that was installed in 1998 when the boiler room was redone and the duct detectors were redone as well. The modular, built in 1996, had its own small ESL fire alarm panel at one point, but now I think it’s gone, and is now run off the 4010 in the main building.
In the main lobby, there’s a 1980s-style graphic annunciator branded by Simplex, obviously not original but probably installed in the 1980s or 1990s (maybe they had a 2001 or something tied into the 4208 at one point.)
Many of the alarms are Simplex 4051+4050-80 horn/lights (blank red lens; a few have the lens missing.) From first glance, this may seem the norm around the building, but there are also…
Two 4051 horns on Space Age AV32 light plates (one in the main gymnasium, and another in the small gym/playroom)
SpectrAlert Advance horn/strobes (in some re-walled classrooms, installed in 2012)
Wheelock MT-24-LSM horn/strobes (in the modular, built in 1996)
Wheelock NS horn/strobe slapped onto a 4050-80 (in the music room)
Simplex 4903-9236 horn/strobe (in the boiler room, redone in 1998)
Pulls can vary too:
Simplex break-glass 4251-30s (the main pulls, a few had the break-glass mechanism removed completely, a couple are missing the hammer)
RSG dual-action T-bars (in the modular)
Notifier BG-12Ls (conventional, located in some classrooms re-walled in 2012)
Edwards/AIP 270-SPOs (five scattered around the building, replacing worn-out 4251-30s)
Autocall/Federal Signal 4050-001Ts (two in the boiler room, installed in 1998)
Simplex break-glass 2099-9103s (two in the main lobby/cafetorium, installed in 2009 replacing worn-out 4251-30s)
Ceiling detection is more consistent. The only regular smoke detector I saw in the main building is an OLD Simplex 4262 ionization detector in the cafetorium. Classrooms, offices and restrooms have Simplex 4255-1 mechanical heat detectors. There are also duct detectors installed throughout the school; the current ones were installed in 1998, and had 2098-9806 test stations linked to each one (these test stations can be found in quite a few hallways, classrooms and other larger rooms.)
The modular seems to have a mix of 90s-style System Sensor and ESL smoke detectors.
There’s talk they may renovate the school soon. If they do, they said I could have some of the old alarm parts! 