If you set a clock to 10:10, the hands form a V. According to marketing theories, customers are more likely to buy a product if they can associate it with a positive emotion. In this case, the displayed V must remind the customer to smile and thus encourage him to buy. Therefore, displayed clocks are usually set to this time.
The position of the hands at 10:10 also has practical advantages. At this time, the hands do not overlap nor the manufacturer’s logo, which is usually located in the middle below the 12 o’clock mark. This way the customer can clearly see all the details of the watch.