1. The Mainspring

The mainspring is made in three forms:
-Spiral coiling: coiling in the same direction in a simple spiral.
-Semi-reverse: End of outer spring coiled in the opposite direction less than 360°
-Reverse (tough): the outer end of the spring is coiled in the reverse direction exceeds 360°
2. The Escapement
The escapement is a tool that transfers energy to the element of timeliness and lets count the number of oscillations of the timekeeping element. In horology, the second function is called impulse action and locking action of the escapees. Escape is the source of the ticking sound in watches and clocks.
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4. Bezel
Bezel is part of the watches are designed for protecting the watch face, or like a ring that is placed around the wrist watch to hold the glass in order not to loose. It's not funny if when we were clapping or hitting mosquitoes suddenly the glass off and then rolling on the floor.
5. Dial
Dial was serving the whole of the clock information from the second, minute, hour, date, day, (sometimes) months, stop watch, the numbers / symbols time, name of manufacturer, type of winder, get waterproof / no, hold depth how meter (water resistant watch only), etc..