That looks almost exactly like your profile picture just a little bit of a different color and a tiny bit different of an angle
Those are model # 2400TH.
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I hate to break it to you but 2400TH’s are actually rather common to see in buildings, but they are sometimes used in residential security systems.
Yeah I know I kind of just post all of my fines here that are kind of good because there isn’t actually just a home searching topic
They started selling alarms Around 1978
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A BRK SS729/749!? Those are RARE!!!
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Don’t you have a smoke sentinel from the 60s though?
I was asking a question about when FireX started making smoke alarms not when smoke alarms started being made.
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2x ESL 320M
3x BRK 2839AC-I?
2x BRK 1839AC-I
All in the same house, and these are oranged rather than yellowed
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Yeah. I swear I’ve seen those before, but the only make & model I can definitively seem to match them to right now is the Pyrotector Smoke Switch 30-290.
That or a TC49D.
Yeah actually!
Or possibly 2400AIT, 2400AT, 2400T, 2412TH, or 2424TH.
Dang, excellent job in finding those!
Mhm!
Pretty sure that’s what those are going by the white button & the little hole on one of the grilles.
Really? Neat.
That’s what decades of sun exposure does to detectors.
KF industries made some ones that look like that also
TC49Ds don’t have test buttons if you look you can see this as a test button
Oh yeah, though none of them have that light in the middle: the 30-290 does however.
If they don’t have test buttons then how do you explain this? I’m fairly certain the CD-200A & the TC49D use the exact same shell, just with different electronics for their different power sources (& that they both have a test button despite said different electronics).
I just noticed that somehow before that I didn’t notice the test button on them and I thought they worked the same way tc49as and tc89bs worked
Yea it’s one of my all time favorites and is currently my 2nd most wanted unit. Still trying to find an operating one 
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Yea the Smoke Sentinel 255S from 1968
As an owner of a TC49D I can confirm that they do have test buttons
I really want to find a CD400A (escape light ver. of the 200A, extraordinarily rare) and considering my crazy luck lately it might happen lol
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