Mechanical automatic watch calendar will be half a frame past the window

There are generally three types of calendars in mechanical watches

Slow crawl: this mechanism will start triggering the calendar jump at around 21:00, after which the calendar will start moving very slowly over time, and then jump completely to the next day at around 3:00 am

Fast jump: the method currently used by most mechanical movements, which will likewise start triggering the calendar jump at around 21:00, and then the calendar will slowly move to the next day. The calendar will slowly run to the next day, and then jump to the next day instantly at a certain time around 0:00 am

Instantaneous jump: there will be no "preparatory work" for the calendar to jump, and the calendar will be completely jammed before jumping, and there will be no "half frame", and when it is 0:00 am, there will be no "half frame", and when it is 0:00 am, there will be no "half frame". The calendar is completely stuck before the jump, and there will be no "half frame", and when it is about 0:00, the calendar will jump to the next day instantly