Miyota 8285

	Brand:	Miyota
	Family:	Miyota 82/8N Series
	Height:	5.94 mm
	Jewels:	21
	Reserve:	42 hours
	Frequency:	21600 A/h
	Winding:	Automatic, Central Rotor Automatic Winding, Counter-Clockwise Automatic Winding, Uni-Directional Automatic Winding
	Diameter:	29.20 mm (13 ligne)
	Complications:	Date, Day, Hand Winding, Outer Day Wheel, Quick Date Correction
	Hands:	Central Hour Hand, Central Minute Hand, Central Seconds Hand, Date Window at 3:00, Day Window at 12:00

Distinguishing Technical Characteristics
Central-Rotor Automatic Clockwise Balance Cock Balance, Balance at 5:00
Production:  –
1910s	1920s	1930s	1940s	1950s	1960s	1970s	1980s	1990s	2000s	2010s	2020s

Part of the Miyota Cal. 8200 family, Cal. 8285 is a day-date central seconds automatic movement. Unlike the day-date Miyota 8205, Cal. 8285 features an outer day wheel, showing the day of the week in full at 12:00 instead of an abbreviation at 3:00. It is mono-lingual.

All members of the Miyota 8200 family have indirect seconds, which causes a noticeable wobble to the central seconds hand. When struck, the seconds hand can appear to pause for up to 2 seconds due to slack in the movement.

The movement can be manually wound with the crown in position 1. Rotate the crown clockwise to wind the mainspring.

The day and date wheels are advanced with the crown in second position (one notch out). Turn the crown counter-clockwise to advance the date wheel by one day. Turn the crown clockwise to advance the day wheel.

The date should not be set between 21:00 and 1:00 and the day should not be set between 1:00 and 4:30. Doing so risks damaging the movement.

The time is set with the crown in third position (pulled all the way out). Rotate the crown clockwise to advance the minute and hour hands and counter-clockwise to turn them backward.

• OH = Open Heart at 7:00
• SK = Skeleton
• PS = Partial Skeleton
• HH = High Hands
• OD = Outer Date
• SR = Solid Rotor