Typical modern clock in for a new movement 

Here is a modern clock that needed a new movement. Sometimes Howard Miller clock company  , slighe clocks  , Colonial clock company and several othes use the same movements . A clock gets a new movement when the old one is worn out from time . Just think how amazing it is when it ran 24 hours a day 7 days a week  for 30 years or more. If taken care of the new one will last like the old one.  A clock should be serviced every two years or so . I've always liked the moon dial with the moon and stars on it like this one .