Sellita Cal. SW400-1 is an enlarged version of Cal. SW200-1, an automatic movement with date based on the ETA 2824-2 design. Measuring 31.00 mm in diameter, the added width allows a larger date wheel to be fitted.
Sellita SW400 History
Sellita introduced Cal. SW400-1 in in 2014 for the oversized watches that were becoming popular at that time. Variously described as 13.75 or 14 ligne, it pushes the date wheel out to the edge of the dial on watches over 40 mm. It even uses the same main plate as its little brother, with a large “spacer” added to enlarge the movement. A small seconds version, Cal. SW461-1, was added in 2019.
Sellita SW200 Technical Information
All automatic winding members of the SW200 family include bi-directional winding using a central rotor. The winding mechanism contributes to the overall thickness of the movement, adding 1 mm compared to the more-integrated winding system on the SW300/2892.
The Sellita SW200 design includes an extra jewel (bringing the total to 26) between the barrel and ratchet wheel. This serves mainly as a technical differentiator between the movements and is not an area of deficiency in the original design.
In 2008, Sellita modified the tooth profile of three wheels in the winding system to make them more resistant to shocks and wear. This resulted in the “-1” series of movements (e.g. SW220 became SW220-1). All other components are identical between these movements.
The similar SW400 movements are larger, at 31.00 mm diameter, but are otherwise similar in design and construction.
Sellita SW200 Family
| Complications | Hand Winding Calibres | Automatic Calibres |
|---|---|---|
| No Date | SW210-1 | |
| Date Only | SW215-1 | SW200-1 SW400-1 (31 mm) |
| Day-Date | SW220-1 M | SW220-1 |
| Date by Pointer | SW221-1 M | SW221-1 |
| Outer Day-Date | SW240-1 M | SW240-1 |
| Small Seconds at 6:00 and Date | SW216-1 SW261-1 M | SW260-1 SW261-1 SW461-1 (31 mm) |
| Moon Phase and Date | SW280-1 M | SW280-1 |
| Moon Phase, Power Reserve, and Date | SW285-1 M a SW285-1 M b | SW285-1 a SW285-1 b |
| Central Moon Phase and Date | SW288-1 M | SW288-1 |
| Small Seconds at 9:00 and Date | SW219-1 SW295-1 M | SW290-1 SW295-1 |