I found this alarm in an old building in Milwaukee. I have never seen an alarm that looks like this. Please let me know if you know what it is! All help is appreciated!
That’s an earlier Edwards Adaptahorn if I’m not mistaken, these usually were grey and had a “FIRE HORN” plate on the bottom side of the horn’s grille, but it looks like this one got painted over, although I can’t precisely tell from that distance.
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That is an Edwards model 360-L horn
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There are red & “plate-less” models too (I think the flush-mount versions of said models are especially rare).
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