This is on top of an old school building that is from the 1920’s. It was likely an IBM bell system from around the 50’s based on the 4” bells that are still in some parts inside the building. The building has long since been updated many times and this bell has been disconnected for many decades. They now use an electronic PA system.
What an odd place for a bell if you ask me: most are mounted on either interior or exterior walls, but I think that’s the first one I’ve seen mounted on a roof.
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Yeah it has always confused me. It is in the playground area so it was probably used as a recess bell at one point a very long time ago.