A mechanical watch is so named because it contains inside the outer case, a mechanical movement. Such movements were used in clocks for centuries before being adapted for watches.

Yes watch is a very good example of a commodity which fits in all three categories. 

When someone asks me what time it is, I can usually answer before people even start reaching for their phones. It takes a lot less effort to rotate your wrist and move your eyes than take a phone out, press a button, get distracted by notifications and lock your phone again. Also, watch batteries last much longer than phone batteries. Some people l

An automatic watch winds a spring, while a kinetic watch charges a capacitor or battery.