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Horological Meandering

Super nice trio but...

 

Technically, Spring Drive is not quartz and does not use a battery.

AI says:  Seiko Spring Drive is not the same as a traditional quartz movement; it is a hybrid technology that combines a mechanical mainspring with a quartz crystal for precision regulation. A standard quartz watch uses a battery to power a circuit that sends a pulse to a stepper motor, while a Spring Drive uses a wound mainspring as its power source and an electromagnetic brake, regulated by a quartz oscillator, to control the speed of its continuously sweeping hand.

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