Some interesting/educational videos on the workings of mechanical watches.
First, from 1949, a video produced by the Hamilton Watch Company:
A simple demonstration of the basic design and operation of a watch. The inside "works" are shown in stop-motion animation using giant 7.5 foot, in-line movement, exact and to scale in every detail. [See the source for higher resolution versions.]
Second, a beautiful video showing some high resolution video shots of a mechanical pocket watch:
[See the source for a description.]
(More bits on clockworks here: http://blekko.com/ws/+/beslayed/clockworks .)