The Siren Board

I was roaming on Google Maps, and I saw this, what seemed to be, fire siren. I honestly didn't know if it was, but because it had the curved top, I assumed it was a Darley model 5/7. However, it just looks more curvy than a Darley. Here's the location: https://maps.app.goo.gl/qncig

-Connor B

Yes, that is a Darley Model 5. The top AND the bottom louver is curved.