The Citizen 8200 movement is Citizen’s old movement and is used in many Citizen watches. Its function is very good, simple and durable, but it is a one-way winding and requires a lot of exercise. The movement is very good and many new models are still in use. It is a very practical movement, no worse than other watches worth tens of thousands of dollars. Theoretically, the daily error is within 20 seconds+, and 21 balls means there is a gem axis in the middle. To prevent wear and tear from affecting accuracy.