The Siren Board

I found this low mounted model 7 in a small town so I got this Picture of the tag. The tag claims the siren is a model 7, even though it is clearly dual tone. Is that normal? I also wanted a date code out of the serial number.

That's not particularly unusual. Federal didn't always add the "T" to the tag on dual tone sirens, especially on earlier units. It's something they started doing most commonly on later FS&S and FS units.