Cal. SW220-1 is an automatic movement with day and date from Sellita. Like other Sellita SW200 movements, it is based on the design of the ETA 2800 family, and is equivalent to the ETA Cal. 2836-2. Sellita has produced this movement since 2008.
Cal. SW220-1 M is a hand-winding version introduced in 2018.
Sellita SW220-1 Applications
Many manufacturers base their movements on the Sellita SW200-1. Similar movements that vary only in decoration include Oris 735 and 751 and TAG Heuer Calibre 5 Daydate Link. Movements based on the SW200-1 with modules or more modifications include Mühle SW 220-1, Oris 743, 745, 747, 748, and 752.
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 |