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As demand for "hummers" went up, so did the prices. They are easy to distinguish because of the unique "backset" system.
By comparison, a self-winding watch at that time had about 136 parts, 26 moving.
The drive-coil becomes a magnet and gives an impulse to the permanent magnet.
The movement of the permanent magnet in the driving-coil also causes an induction voltage opposing the power cell voltage.
The vibration of the tuning fork is controlled by a transistorized circuit.
When the left magnet on the tuning fork moves to the right, the phase-sensing coil generates an induction voltage on the base of the transistor.