An electrically wound, gravity driven turret clock

A turret clock is a large mechanical clock set in a tower for use by a large number of people.

Typically found in a church tower or other public building the clock mechanism drives the hands on one or more large clock faces visible from the outside. A clock (from the Latin cloca, bell) is an instrument for measuring time. ... A clock face is the part of an analog clock that tells time through the use of a fixed numbered dial or dials and moving hand or hands. ...