That’s one really big fire alarm. And yeah, that’s really rare
That’s actually a Space Age AV34, a larger version of the AV32.
Considering it has a Thorn logo on it, I’d say it is. The Thorn model V7001T-24-W-FR which is obviously not very different from the Wheelock model of V7001T
The rarest I seen was the Simplex 2001-8001 at my college. You’ve already probably seen photos of it as I’ve posted it here numerous times. Still in service.