Probably Victorian servants bell, the clanger is missing and would have been mounted on a coiled spring connected by cord to a room in a property.
No object is more evocative of historic household communication than the sprung bell. This device, worked by a complex system of wires, allowed for a member of the household to pull a lever, thereby ringing a bell located in the service areas. The bells were typically mounted in stairwells, outside servants' quarters and in some instances, inside servants’ rooms.
Each bell hung from a coiled spring so that a pendulum – also suspended from the spring – would continue to move even after the bell had stopped ringing. This way, servants had time to move from the service areas to the bell system to see where they were required.