Sorry, I got it wrong. I was excited and assumed that the first siren to sound was electronic because it was the first thing to pop into my head, heh. It was suggested to be a single-tone Klaxon GP of some kind.
99% sure it's a GP6 or GP10, which both have a single 10-port rotor. They can wind up very quickly on a strong/stable power supply, as can be heard in this ambience/audio of a GP6 from YouTube: https://www.youtube.com/watch?v=qq85Qw5kz2E
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