An automatic watch has a mechanical movement and does not need to be regularly wound. Its power comes from the movement of your wrist as you wear it. Most automatic watches have a power reserve of up to 36 hours.
A mechanical movement that requires no winding because the rotor, part of the automatic mechanism, winds the mainspring every time you move your hand.
A mechanical movement that is wound through the motion of the arm during normal daily wear; sufficient activity is required to build up a power reserve. Also known as "self-winding".
A movement that is "wound" by the motion of the wearer.
A movement that is all mechanical and requires no winding as this is done every time you move your hand.