vintage mechanical door bell, mid century 2 tone chime for shop or store door

mid century hand operated door bell or chime. This bell is made to be mounted on the inside of the door and the person outside would ring the bell with another knob or handle on the outside of the door. It's all mechanical, no electricity is required.

The outer knob shank would go right through the door (just like a regular doorknob), and fit into the socket of the bell, rather than an a knob.

This measures about 6 1/2" long and there's no mounting or control hardware included, just what's shown. This has light rust to the metal cover and peeling and damage to the musical notes decal.