This antique doorbell mechanism works with a pull string attached to a door, which would pull the wire to ring the bell. The coiled spring mechanism helps to create a loud ring when activated. These types of bells were used to summon staff in large homes or alert shopkeepers to a customer's arrival. The original mounting screws are not available. Good condition with surface wear and rust from prior use. In working order. The manufacturer and exact date of creation are unknown. The dimensions are 10 in. H x 7 in. D x 3 in. W, bell 3 in. diameter.