Most visitors online was 1660 , on 12 Dec 2020
Well cared for may have lots of meanings. It may be they dusted the case regularly.
Clock movements of of that vintage have a life span and that is about 25 years.
Clock movements are machines and will wear like any other machine.
You may see reliability problems, especially with the chime train. The chime train is the train that needs the most power,
the heaviest weight and normally will be the first of the three to fail.
Even though a new replacement is not available, you have the option of someone rebuilding the original movement.
A proper rebuild of that movement will not be cheap.
I say proper because there are plenty of clock repair people out there who do shoddy work.
A cheap repair will result in a short lived repair.
Many times a clock is offered for sale because the movement needs to be rebuilt.
Seldom are clocks in good shape offered for sale.
I hope you have found the exception.