Also the Seiko Spring Drive. . . . the Tri-synchro regulator uses three types of energy to regulate the moving parts and establish synchronicity: * Mechanic

Also the Seiko Spring Drive. . . . the Tri-synchro regulator uses three types of energy to regulate the moving parts and establish synchronicity: * Mechanical power, from the mainspring * Electrical power, creating a reference signaling via an IC/quartz oscillator * Electromagnetic power, to apply a brake via a rotor/stator. These three forces work in harmony to regulate the way the spring unwinds and to make possible the precise movement of the second hand. https://www.grand-seiko.com/sg-en/collections/movement/springdrive https://www.grand-seiko.com/sg-en/collections/movement/sprin...