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Why do some mechanical watches not jump the calendar at 12 o'clock?
The movement watch does not need to replace the battery. After regular maintenance and oil washing, it can be used safely for a long time. It is larger than a quartz watch. Due to the quality of the manufactured product and the movement of the watch's internal structure, it is easily affected by the adverse effects of the earth's gravity and causes deviations. Usually quartz watches are calculated in terms of monthly offset seconds, while mechanical watches are calculated in daily offset seconds.
Why do some mechanical watches not jump the calendar at 12 o'clock?

During the operation of a mechanical watch, a certain amount of space is required to ensure normal operation. Therefore, no matter how the mechanical structure design is adjusted, there will always be a gap. The accumulation of gaps between each component will produce a deviation. This deviation is within the allowable range and is a qualified product. If it exceeds the statistical range, it is a non-conforming product. The calendar jump deviation of mechanical watches is basically in line with the standard between -0.5 and +1.0 hours. If it is required that it jumps the calendar on time at twelve o'clock, it is impossible and unnecessary. Of course, as I just mentioned, mechanical structural design is basically biased. It is not impossible that the positive and negative deviations add up to exactly 0. Therefore, it is very possible that a watch will jump at exactly twelve o'clock, but that is not representative. In fact, not only is there a deviation in the jumping calendar, but also there is a deviation in the travel time of the mechanical watch.

Some date displays will jump after two o'clock in the morning. If they still don't jump, you can adjust them yourself.
1. Pull out the crown of the watch and adjust the day display and date display in the first position. Pull out the second position to adjust the time. Pull out the first position first to prepare the day display and date display;
2. Take the Laco Luculent mechanical watch as an example. Turn the crown up and down to adjust the day display and date display respectively. If the day display is February 20th, you can adjust the day display and date display to yesterday's day display six, the 19th;
3. Pull out the watch handle to the second gear to adjust the time. Rotate the watch handle clockwise to rotate the watch pointer one or two times until you can see the pointer reaching around 12 o'clock. The day display and date display will jump to day display and 20th respectively at the same time. This means that the watch time has entered 1-12 o'clock in the morning. If it is the morning, just adjust the time;
4. If it is the afternoon, follow the usual method of adjusting the time on a watch. After rotating the pointer once, the watch time will enter 1-12 o'clock in the afternoon. Then adjust it to the current correct time. That's it.
Special note: Adjustments cannot be made between 9 o'clock at night and 5 o'clock in the morning. Since the date change mechanism of the timetable between 9 o'clock at night and 5 o'clock in the morning has already been engaged, adjusting the time at this time will damage the date display gear. This period is also called the red line area. In addition, if you want to protect the gear, when adjusting the time of a watch with a date display, adjust the time as far forward as possible and not backward.