How to adjust the calendar of the wall clock to normal? I accidentally adjusted the year to 202 1. How to adjust back to 20 16?

If it is excessively adjusted, it will be more troublesome. It is recommended to send it to a professional watch bank for the master to check and adjust. Generally, a perpetual calendar can only go forward, not backward. If it doesn't matter after two or three days of adjustment, put away your watch and let it stop. Wait until the day of adjustment to put it on and let it continue. If it has been adjusted for a year and a half, it can only be sent to professionals to adjust the watch to the correct time.