A watch which can additionally tell the time, at the push of a button or move of a small slide on the side of the case, by striking the hours, quarter hours and minutes since the last quarter hour on small goings inside the watch. Such complex watches are never inexpensive. A graphic display by means of a specially shaped aperture in the dial to indicate the phase of the moon, i.e. full, new or somewhere in between. Very popular in the 90's but losing favour in the second half of the century. The inner mechanism of a watch that keeps time and moves the watch's hands, calendar, etc.
Movements are either mechanical or quartz.
A battery reserve indicator on a quartz watch informs the wearer when the battery is low. Often this is indicated by the seconds hand moving at two or three-second intervals. When a Seiko Kinetic needs to be wound, the seconds hand will also move in two second intervals. Most are used to stop and start a stopwatch but sometimes serve other functions. A movement powered by a quartz crystal to.