WAutomatic quartz
WBalance wheel
WBarrel (horology)
WCalifornia dial
WChinese standard movement
WClock face
WClockwork
WDamaskeening
WDouble chronograph
WEscapement
WFlying pendulum clock
WFusee (horology)
WGyromax
WJacquemart (bellstriker)
WJewel bearing
WLavet-type stepping motor
WMainspring
WMiyota 8215
WPallet fork
WPin-pallet escapement
WPower reserve indicator
WSeconds pendulum
WSpring Drive
WStackfreed
WMovement (clockwork)