This is a functional all-mechanical pendulum clock with a Graham or “deadbeat” escapement. The watch hands (hours, minutes, and seconds) each have their own dials, allowing the gears to be spread out horizontally. This lets you see each gear individually and understand how the whole gear chain works together to create the 60-to-1 gear ratio between the second and minute hands, and the 12-to-1 ratio between the minute and hour hands.
While this model will tell time, and can be adjusted (by changing the length of the pendulum) to tell time within a few seconds per hour, it will only run for about half an hour at a time before the drive weight has fallen all the way to the floor. This (relatively) rapid movement of the weight allows you to clearly see how energy is being supplied to the mechanism by the lowering of the weight. In other words, this is a demonstration model, not a practical clock to tell time with. (For that we have our Electric Clock model, which is nearly identical except that the pendulum is replaced with a battery-operated clock motor.)