Does anyone know what this is?

I passed by an old firehouse with my dad and I happened to see this on the firehouse. It looks like a siren but I don’t know what it actually is. I have seen objects that look like sirens but weren’t so this may not be a siren.

It appears to be a Federal Electric (Fedelcode) Model-2 siren. It’s from the 30s and has a specialized coding mechanism. They’re not rare but not common.

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