One way to distinguish between Standard/Special and Premium/COSC grades of the SW200 is to look at the anti-shock device:
Sellita Date Codes:
Under the balance wheel, near the caliber number engraving, you may have seen what looks to be a laser etched code containing DM and XYZ.
DM means that the movement origin is from Sellita Watch Co.
XYZ is a Sellita code (we’re not sure the meaning, comment below if you know)
As for the date part of the code, new movements produced in 2018 look like this:
DM18.1/XYZ = JAN+FEB
DM18.2/XYZ = MAR+APRIL
DM18.3/XYZ = MAY+JUNE
DM18.4/XYZ = JULY+AUG
DM18.5/XYZ = SEPT+OCT
DM18.6/XYZ = NOV+DEC
There is also a code for what Sellita refers to as “Renewed Movements”. The meaning of this still needs to be confirmed, but it appears that this is for movements that were sent back to Sellita for renewal. Perhaps brands are able to buy them at a discount. We still don’t know, but please check your movement for a two digit number starting with 2X. For reference:
A 2-digit customer service code is engraved to show that the movement has been renewed.
20 for 2020, 21 for 2021, etc.
Case study pics coming soon.
Sellita Caliber SW200-1 Drawings
Official Sellita documentation states that the crown should be in the time setting position before being extracted. Use a 1mm screw-driver, avoid using tweezers or any other tool with a point because this could jam the setting lever and damage the setting lever spring.