We have a Ridgeway Clock, originally purchased in 1983 for just under $1400. I have verified that it has all the parts and functions fully. It has quite a bit of dust inside and from what I have read, must be blown out with compressed air to clean the mechanism.
On our wavy / slanted floors, it will run for about an hour before the pendulum stops. Cleaning it out and being on level ground should relieve that issue.