Mechanical watches must not do four things: 1. Setting the time and calendar in wrong way. Stop adjusting the time and date between 9 p.m. and 3 a.m. Because during this period of manual adjustment time is likely to cause damage to the gear assembly, resulting in the state of calendar dislocation, serious will affect the accuracy of the watch. The best time to adjust is between 5 and 7 2. Play with the crown The crown is a small mechanism into the watch handle, but it is used to coordinate the movement of multiple parts, the main function of the crown is to adjust the time and calendar, as well as the winding function of the mechanical watch. Therefore, for the watch is the most easy to water crown gap, only here is often needed to be opened and operated. Therefore, the crown must be treated gently, not violently. After adjusting the time and calendar, be sure to restore the crown to its original position. Remember to check the crown before contacting the water and push the crown to the bottom.