What kind of siren is this?

[mayer22]

So recently my grandfather passed away, he was a retired fire captain and several of his firefighting items were handed down to me (probably enough to start a small museum) anyhow, found this in one if the boxes. I know it's a Q type siren just no info on it. Plan on keeping it, as it was on his personal vehicle at one point, and possibly an apparatus, not sure. Just looking for info. Thanks!

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