How do you construct a watch using crystal oscillator?

To construct a watch using a crystal oscillator, first select a suitable quartz crystal that oscillates at a specific frequency, typically 32.768 kHz for watches. Connect the crystal to an oscillator circuit, which converts the crystal's vibrations into a consistent electrical signal. This signal is then fed into a frequency divider circuit that reduces the frequency to a 1 Hz pulse, suitable for driving the watch's timekeeping mechanism. Finally, integrate this with a display system, such as an LCD or mechanical gears, to show the time.