Here are some pages with information about clocks and their inner workings:
Bowers Watch and Clock Repair in Atlanta, GA has this page: "Looking Inside Clocks"
To find some interesting videos on the inner workings of clocks and watches, check out the YouTube channel of the National Clock and Watch Museum, in Lancaster, PA. There are lots of videos that show the inner mechanisms of clocks, and talk through clock and watch repair and maintenance.
The National Association of Watch & Clock Collectors keeps this page of horology resources. There are links to lots of resources about horology, timekeeping, collecting, repair and restoration, and more.
This article, entitled "The Roaring Twenties — The Most Important Decade for the Wristwatch?" published by the watch company Revolution gives a cultural history of the wristwatch in the 1920s
Another article, "The History and Elegance of 1920s Watches," focuses on the emergence of wrist watches as a popular accessory in the 1920s.