Sellita Caliber SW330-1

Manufacturer	Sellita
Caliber Number	SW330, SW330-1
Base Caliber	Sellita SW300-1
Movement Type	Automatic, self-winding mechanical
Lignes	11.5”’
Diameter	26.20mm
Casing Diameter	25.60mm
Thickness	4.10mm
Jewels	25
Vibrations Per Hour	28,800 bph, 4Hz
Lift Angle	51 degrees
Amplitude Range	200 – 315 degrees
Power Reserve	42 hours
Rotor Style	Ball bearing
Rotor Winding Direction	Bi-directional
Hand-Windable?	Yes
Anti-Shock	Incabloc
Spring	Nivatronic, Nivaflex NM
Balance Wheel	Nickel or Glucydur
Main Plate Material	Brass
Bridges Material	Brass
Hand Count	4
Functions	Central hours; central minutes; central sweeping seconds; central GMT hand; date at 3:00
Hacking Seconds?	Yes
Quickset Date?	Yes
GMT Type	Office GMT / Caller GMT
Country of Manufacture	Switzerland, Swiss made
Known Models	Bravur Geography, Monta Atlas, Muhle Glashutte Seebataillon GMT, Bamford London GMT, Farer Oxley, Farer Lander III, Dufrane City Limits GMT, Steinhart GMT-Ocean, Zahnd & Kormann No. 2 GMT (Please add yours to the comments below…)

The Sellita SW330-1 is an automatic watch movement with a second time zone display via a centrally located GMT hand. This movement was introduced to the market in 2015.

Sellita SW330-1 VS ETA 2893-2:

While the components are not 100% interchangeable, the caliber SW 330-1 is essentially a clone of the ETA 2893-2. In fact, these movements are so similar that brands will often use them interchangeably and not disclose which one you are getting beforehand. If the brand lists both calibers and you prefer one over the other, be sure to make the request when ordering your watch new from the manufacturer.

Dimensions, beat rate and power reserve are among the many similarities, but one notable difference is the jewel count. The SW330-1 has 25 jewels and the ETA 2893-1 has 21 jewels.

Here is an image comparing the two movements:

3 Grades and Accuracy:

There are 3 grades of the Sellita cal. SW330-1. The grades and main differences are as follows:

• Spécial (Elabore) – Nickel balance wheel, adjusted in 4 positions, average rate of +/-5 seconds/day, maximum deviation of 20 seconds/day in all positions, isochronism of +/-15 seconds/day.
• Prémium (Top) – Glucydur balance wheel, adjusted in 5 positions, average rate of +/-4 seconds/day, maximum deviation of 15 seconds/day in all positions, isochronism of +/-10 seconds/day.
• Chronomètre (COSC) – Glucydur balance wheel, COSC criteria

To sum it up, the Premium grade will give you better timekeeping and a more refined look than the Special grade. You can learn more about Sellita grading here.

Interesting note: This may not be interpreted correctly, but Sellita seems to mention in the official documentation that when a lot of movements are purchased, only 95% of them must be within the specified limited.

Finishing:

There are two main finishes from the factory: Standard and Refined. There is an option for custom or tailor-made finishing as well.

Crown Positions:

• 1 – Manual winding
• 2- Quick adjustment of the date, quick adjustment of the GMT hand
• 3 – Time setting, hacked seconds

Removing the crown and stem:

With the crown in time setting position, gently place a 1mm screw driver in the setting lever slot to press the detent button. Do not use tweezers unless you want to risk messing up the setting lever.

Replacement Prices:

At the time of this post, replacement prices for the calibre SW330-1 were found online for around $480.00 USD.

Sellita SW330-1 VS SW330-2:

See the SW330-2 post here for more information about this.

Additional Resources:

• Sellita’s official SW330-1 tech sheet here
• List of Sellita watch movements