Automatic Watch Movement
Automatic winding or self-winding—in order to eliminate the need to wind the watch, this device winds the watch's mainspring automatically using the natural motions of the wrist, with a rotating-weight mechanism.
Hand Winding Watch Movement
Manual or hand winding - the wearer must turn the crown periodically, often daily, in order to wind the mainspring, storing energy to run the watch until the next winding.
Tourbillon Watch Movement
Tourbillon—this expensive feature was originally designed to make the watch more accurate, but is now simply a demonstration of watchmaking virtuosity. In an ordinary watch the balance wheel oscillates at different rates, because of gravitational bias, when the watch is in different positions, causing inaccuracy. In a tourbillon, the balance wheel is mounted in a rotating cage so that it will experience all positions equally. The mechanism is usually exposed on the face to show it off.