There is nothing utilitarian, appropriate and elegant to wear on a wrist than a watch. By common acknowledgment, a wrist watch is considered to be the most precise and best engineered thing in micro-engineering. For the price of a dinner for two, a wrist watch has the simplicity of looks, the complexity of movement and the unity of operation.
A wrist watch, which in this context must be a mechanical watch (either an automatic or manual watch), has a complicated set of cogs, gears, wheels, barrels, bridges, springs, etc. These are powered by a mechanism (hence its name) to measure time. This mechanism includes a winding spring that keeps and then slowly releases the energy needed to power the watch. Instead of a digital display, it will always have a traditional dial (the face covered with a transparent glass or plastic) with a set of hands, two or three of them, to indicate the hour, minutes and sometimes the seconds on the watch. A smart watch has none of the above. While it tells time, it is not a watch anymore that a television, radio, vehicle dashboard, cellphone, etc, are not watches, although they all tell time. Small wonder that those who who are confident enough to treat an accessory of the arm as if it were an accessory of the head - the ear ring - which is typically worn on both ear lobes, sometimes wear a wrist watch on one wrist while they simultaneously wear their smart watch on the other wrist. They know or ought to know that despite this, they are really wearing only one watch!
