A hand-winding watch requires the wearer to wind it up manually, so that the mainspring gets tightened up and stores ample power reserve to drive the watch. Also known as ‘manual-winding watch’.
Also known as a balance spring, a hairspring is used in a mechanical watch and its function is to help control the frequency of the movement. A flat spiral spring, the hairspring is fixed within the balance wheel and pivoted at the middle. As it coils and uncoils, the hairspring causes the balance wheel to oscillate. This action impacts the rate and speed at which the wheels of the movement turn. (See also: ‘Balance Wheel’ and ‘Escapement’.)