Sellita caliber SW300 / SW300-1

The Sellita caliber SW300 (sometimes written as SW-300) is the slim version of the Sellita caliber SW200. The SW300 is 3.6 millimeters thick, the SW200 is 4.6 millimeters thick. There are quite a lot of SW300 calibers, so let’s see which one could be inside your watch.

First generation of the Sellita SW300

The first generation is launched in 2004 as an alternative to the ETA 2892-A2. The SW300 shares a similar architecture and is designed to be a high-quality, reliable option for the ETA. As ETA began to limit the availability of its movements to external companies at the time.

Second generation, the Sellita SW300-1

The second generation (updated 1st gen) is launched in 2011. The goal was to improve the overal performance and quality, with more power reserve and more durability.

The base of the SW300 remains the same, but where possible Sellita changed parts. The size is also kept the same, as well as the architecture. And all still very near the ETA that is cloned.

Sellita SW300 vs Sellita SW300-1

The primary difference between the SW300 and the SW300-1 involves some technical refinements for better compatibility with certain applications. Including a few adjustments in gear train design.

Other improvments are the mainspring, the automatic winding system and shock resistance with better jewels, balance wheel, and escapement. But the fundamental architecture remains the same, and a lot of parts are interchangable.

Different Sellita caliber SW300-1 models

Accuracy of the Sellita SW300 / SW300-1

The accuracy of the standard Sellita SW300 / SW300-1 varies between +/-12 seconds per day up to +/- 30 seconds a day. The Special (Elaboré) version has an accuracy of +/-7 up to +/- 20 seconds per day. And the Premium does +/-4 up to +/- 15 seconds per day. The Chronometer version complies with the COSC certification criteria; -4 up to +6 seconds per day.

All models from the SW300 series are available with different grades of finishing:

Standard: Basic decoration and adjustment.
Special/Elaboré: More refined decoration and slightly better accuracy.
Premium/Top: Highest level of decoration, better materials, and more precise regulation.

Read the specifications of the Sellita caliber SW200 to find out more about the grades.

Is the Sellita SW300 a good movement?

The Sellita SW300 is generally considered a high-quality movement, especially for watches in the mid-tier luxury segment. The SW300 is almost identical to the ETA 2892-A2, which has a long-standing reputation for being precise, reliable, and robust. This design lineage ensures that the SW300 benefits from years of refinement and real-world testing.

Since it’s based on the ETA 2892, the SW300 is familiar to many watchmakers, making it easy to service and find replacement parts for. A plus for long-term ownership. The price for a Sellita SW300 starts around 300 dollars or euros for the basic models.