SW285-1 M a

	Brand:	Sellita
	Family:	Sellita SW200 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 Balance at 12:00
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.