Here's snap-together kit that allows you to make a working model clock based on one of Leonardo's sketches. The clock uses a horizontal rotary pendulum design commonly known as a verge and foliot. The clock's speed is controlled by adjusting the weight and balance of the pendulum. It can be assemble in either a wall-mounted or standing configuration. The parts are plastic from the looks of it, but it's an attractive piece nevertheless.
Here is where you can get the Academy da Vinci Clock.
For more on clock escapements, check out Practical Clock Escapements by Laurie Penman. With over 400 line drawings the reader is taken step-by-step through the various operations when making or repairing escapements, with recommendations on the materials and tools to be used.