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Any timepiece that makes use of the piezoelectric property of a quartz crystal.

Modern quartz wristwatch

Any timepiece that makes use of the piezoelectric property of a quartz crystal.

Picture of a quartz crystal resonator, used as the timekeeping component in quartz watches and clocks, with the case removed. It is formed in the shape of a tuning fork. Most such quartz clock crystals vibrate at a frequency of32768 Hz.

Any timepiece that makes use of the piezoelectric property of a quartz crystal.

Omega 4.19 MHz high frequency quartz resonator Ships Marine Chronometer giving an accuracy better than ± 5 seconds per year, French Navy issued