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Most self-winding watches have mechanisms to prevent overwinding.
You don't have to turn the switch on the watch to keep it running.
There's a relatively heavy part within each self winding watch, which responds to changes in gravity. This piece will always want to point down. As the watch is worn during the day, it winds itself.
It depends on your watch.
A self-winding watch will have the rotor (a spinning weight) inside the caseback (the "lid" on the underside of the watch), which for some particular makes and models do not have a display caseback (a caseback with a window to show the rotor and the movement) makes it difficult to identify.
One type of watch is known as the "self-winding" or "automatic watch," which winds itself using the natural motion of the wearer. Movement rotates a winding rotor, which winds the watch via a ratchet. Other analog watches also bear self-moving parts, though for most this merely consists of the watch hands and associated gears.
Swiss John Harwood in 1923. it was used to stop work and start prayer back in the old day
Rolex
If the watch is relatively new or still within its warranty period then it may be returned to the manufacturer for repair. Otherwise, it could be taken to a specialist watch and jewellery repair workshop.
A Self-Winding Sidewinder - 1973 was released on: USA: 9 October 1973
The Omega Seamaster Planet Ocean is a watch made by the Omega company. It is a self-winding watch with amazing features like being waterproof up to 2000 feet.
It is a traditional watch, you wind it to get it started again. If it is powered by a battery, you replace the battery. If it is self-winding, you move it in the manner designed to make it work.