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Brand: | Sellita | 
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| Family: | |||
| Height: | 4.15 mm | ||
| Jewels: | 19 | ||
| Reserve: | 42 hours | ||
| Frequency: | 28,800 A/h | ||
| Winding: | Hand winding | ||
| Diameter: | 25.60 mm (11.5 ligne) | ||
| Complications: | Date, Day/Night Indicator, Moon Phase, Quick Date Correction | ||
| Hands: | Central Hour Hand, Central Minute Hand, Central Seconds Hand, Date Window at 3:00, Day/Night Indicator Pointer at 10:00, Moon Phase Wheel at 6:00 | ||
| Distinguishing Technical Characteristics | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
 Hand-Winding  Clockwise Balance Cock  Screw Regulator |
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| Production: 2019 – Current | |||||||||||
| 1910s | 1920s | 1930s | 1940s | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
Cal. SW285-1 M a is a hand-winding movement with moon phase, day/night indicator, and date from Sellita. Like other Sellita SW200 movements, it is based on the design of the ETA 2800 family, though ETA does not sell a direct competitor with the same functions. Sellita has produced this movement since 2019. Cal. SW285-1 a is an automatic version.
The moon phase is indicated using a disc located at 6:00 on the dial and the date is located at 3:00. The day/night indicator is a pointer in a subdial at 10:00. This is very similar to Cal. SW285-1 M b, which differs in that it uses a disc for the day/night indicator.
Images are taken from official publications and are used here for commentary and educational purposes. Copyright is held by the original owner as noted.