That could be a whelen WS-1000
Here’s a video (this one was updated to digital controls) https://youtu.be/4gy0JbmrQfM
Creator of electronic toneset library (pm for details)
owner of an FCH, 2 CD&Fs, 2 UVs and a UV+, electrovoice 848A, MCP A400W amp, 2 200w drivers, and many home made 3D printed sirens
Future owner of an whelen vortex R3 with an ESC-2020
It's not surprising you bothered to ask considering it's you, but connect the damn dots. Speakers on top of a church. The same old story over and over again, they're always church bells. There's even a bell beneath it. It's not hard to deduce. I'm also 99% sure that photo you posted is a Loudoun siren but I could be wrong.