Sellita SW200 is a reliable Swiss made automatic movement. Many famous watch brands use Sellita SW200 movement as an alternative to the ETA 2824 movement. In this blog we will discuss various aspects of Sellita to help you fully understand the SW200 movement.
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Sellita SW200
SW200 is a very stable automatic movement with a frequency of 28,800 vibrations/hour and a very smooth running second hand.The SW200 features hour, minute and second hand plus a date display with a calendar window that can be set in 3, 6, 9 and 12 digits for quick date setting. In addition, SW200 is equipped with 26pcs jewel and ball bearing rotor.Sellita S200 movement specification is below.
Sellita SW200 Grade
Sellita SW200 is available in 4 different grades, each with a different level of precision and finish. These grades are Standard, Special, Premier and Chronometer.
Standard：adjustable in two positions; accuracy from +/-12 seconds/day to +/- 30 seconds/day
Special ：adjustable in three positions; accuracy from +/- 7 seconds/day to +/- 20 seconds/day
Premium ：adjustable in five positions; accuracy from +/- 4 sec/day to +/- 15 sec/day for greater precision and superior craftsmanship.
Chronometer : This is the highest grade for the Sellita SW200 movement. It has been certified by the COSC (Swiss Official Chronometer Testing Institute) for extreme accuracy and precision. This grade is reserved for Haute Horlogerie.
CROWN/STEM REMOVAL
To remove the crown and stem, proceed as follows:
- Unscrew the crown counterclockwise until it is in the fully extended position.
- Gently pull the crown out to the second position (date setting position).
- Press the small lever near the stem to release the stem from the movement.
- Once the stem is released, carefully remove it from the movement.
SW200 and SW200-1 issue
SW200 and SW200-1 ratchet wheel tooth problems are when the watch will feel slippery when winding and will not be able to transfer all of its energy to the mainspring, resulting in a sharp drop in the watch’s power reserve or the watch stopping. If this problem occurs, it is necessary to have the movement disassembled and the ratchet wheel replaced by a professional.
To avoid ratchet problems as much as possible, avoid forceful or excessive manual winding and minimize manual winding of the SW200.
In 2008, Sellita evolved from the SW200 movement to the SW200-1 by changing the shape of the teeth in order to minimize wear and tear on the automatic sprocket wheels. so what were the changes?
Change the movement components
The reduction wheel spindle (1481), the ratchet drive wheel spindle and the wheel (1482) and ratchet wheel (415) were changed, while the other movement components can be interchanged between the two calibers.
Change of tooth shape
Changing the geometry of the gears reduces the risk of damage due to strong shocks while guaranteeing the same power transportation, as shown in the following diagram.
However, after the change from SW200 to SW200-1, the problem of the teeth of the gears being broken still cannot be solved.
In summary, Sellita SW200 is a versatile and reliable automatic movement available in different grades to meet a variety of watchmaking needs. Understanding the different grades, the crown/stem removal process, and the differences between the SW200-1 and SW200 movements will help you make an informed decision when selecting and maintaining a watch that utilizes this movement. While the ratchet wheel tooth issue may present a challenge, it is a minor drawback to a great movement. By choosing the watches with Sellita SW200 movement, you can enjoy accurate timekeeping and reliable performance.
As a professional watch supplier, we can provide various styles of watches with Sellita movements, as well as customized watches with Sellita movements.
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