I'm curious as to what base waveform you started off with. Because the wind-up doesn't sound very much like a sawtooth wave, which is what I use when making mechanical siren synths. The tonal characteristics are pretty close, but the timing sounds more like an analog Whelen controller in attack mod...
https://youtu.be/2gDTFJ4Eo20; Thought I’d try making a youtube channel! This synth turned out a lot nicer than I thought. Plus, it sounds pretty real except for the attack timing, which I need to improve, and the windup and wind down I guess. But still, I hope you enjoy!