Everything has its beginning. And if you believe that time starts from somewhere, also consider the beginning of time measurements.
Early people have devised a system to tell the exact date. But a device that exactly tells the precise time comes much later. Water clocks, sundials, and candle clocks are the earliest instruments that somehow manage to tell time but accuracy is far from achievable.
In the 13th century, weight-driven clocks were developed. It used gears while hour hand was already used while the minute hand was an indication of luxury and wealth. The weight-driven clocks were publicly displayed on church towers, city halls, and monasteries.
In the 16th century, clocks were produced using spring instead of weight. The portable clocks or the pocket watches were the first timepieces that the public can own. During this time, the only persons who can own them were the rich and owning one signified the status, authority, and wealth of the person. Often, portable watches were placed on the wall of the house. The term portable though did not mean it could be carried on your pocket. The term changed its meaning some years later.