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Automatic movement vs Quartz vs Mechanical Hand Wind

One of the most frequent questions I get from watch shoppers is this: What are the differences between a Quartz watch, a mechanical movement watch, and a Self-winding watch?

Self Winding Watch
As the name suggests, a self-winding watch is powered by a spring inside the watch. The spring must be winded up every week or two to keep the watch from working.
In a self-winding manual watch, the wearer must turn the crown or 'winder' to tighten the spring. The timepiece will work for about 30 to 40 hours on one full winding of the mainspring.

A Quartz Watch
A small battery inside the watch powers a quartz movement. Quartz watches, which account for around 90% of the world's men's watches, contain a quartz crystal that vibrates approximately 33 times per second. A tiny computer chip then converts the vibrations into impulses which drive an electronic motor, powered by a battery, which then moves the watch's hands.

Mechanical Movement Watch
A mechanical movement uses energy from a wound spring and keeps time through the regulated release of that energy through a set of gears. In a self-winding watch, the spring is automatically wound by a rotor which turns as the wearer's wrist moves – which is why self-winding mechanical watches are usually referred to as 'automatics' or kinetic.