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In honor of our new member, HamiltonElectric, here are some tidbits upon which he may comment. . .

"The 500 series watch had a moving coil and contact control system. The coil is fixed on the balance, and an electric current flows in the magnetic field, producing an electromagnetic force.

At the moment the magnetic field reached the right and left side of the coil, the contact spring is closed by a small pin on the balance. Thus, electric current through the coil is receive an impulse. . . The basic principle is the same for electric motors."

Source: Collecting Watches by Shugart and Hanson
 
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