Sellita SW200 is a reliable Swiss made automatic movement. Many famous watch brands use the 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.

Sellia sw200

Table of Contents

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, sellita caliber sw200 is equipped with 26pcs jewel and ball bearing rotor. Sellita S200 movement specification is below.

sw200 movement

 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. The COSC (Swiss Official Chronometer Testing Institute has certified it) for extreme accuracy and precision. We reserve this grade for Haute Horlogerie.

sw200

CROWN/STEM REMOVAL

   To remove the crown and stem, proceed as follows:

  1. Unscrew the crown counterclockwise until it is in the fully extended position.
  2. Gently pull the crown out to the second position (date setting position).
  3. Press the small lever near the stem to release the stem from the movement.
  4. After releasing the stem, cautiously extract 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 cannot 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.

 Difference between SW200-1 vs 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 we can interchange the other movement components between the two calibers.

sw200-1 vs sw200

Change of tooth shape

  Changing the geometry of the gears reduces the risk of damage because of 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.

sw200 vs sw200-1

 Conclusion-Sellita SW200

   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 uses this movement. While the ratchet wheel tooth issue may present a challenge, it is a minor drawback to a significant movement. By choosing the sw200 watch 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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