Found this on Ebay

Emergency Warning Systems
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I don’t know what model this is but it almost looks like an old Darley siren to me.

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It’s a General City Service Co siren, so it’s GCS. A Detroit based company that rebranded Federal sirens. It is similar to Darley rebranded Federals, but not exact.

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Ok. When I saw GCS on the siren I thought that they were the company that installed it and not rhe company that made it.

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Here’s some information on GCS.

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Their logo:
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