|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|
Clockwise Balance Cock
|Production: 2019 – Current|
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.