The guy who posted this on YouTube is not sure what model it is. It sounds sort of like a 2001 with a broken rotator, but the wind-up is different, and the siren is not as loud as a 2001. I don't think it's a Federal Model 5 either, but it could be an underpowered Model 7. Can anyone identify this siren?
http://youtube.com/watch?v=SA7NYGFYahI