Automatic (Day & Date)

A reliable Japanese automatic movement featuring both day and date complications. Manufactured by Miyota, a division of Citizen Watch Co., the 8285 is known for its durability, efficient winding system, and dependable everyday performance, making it a popular choice for classic and dress watches.

The Miyota 8285 is an automatic mechanical movement developed by Miyota, a division of Citizen Watch Co., Ltd. It combines reliable automatic winding with manual winding capability and features both day and date displays, offering dependable performance and easy maintenance.

 

Specification

Details

Manufacturer

Miyota (Citizen Watch Co., Ltd.)

Caliber

8285

Movement Type

Automatic with Manual Winding

Functions

Hours, Minutes, Seconds, Day & Date

Jewels

21 Jewels

Beat Rate

21,600 BPH (3 Hz)

Power Reserve

Approx. 42 Hours

Diameter

26.00 mm

Height

5.67 mm

Accuracy

-20 / +40 seconds per day

Hacking Seconds

No

Country of Origin

Japan

Operating Instructions

Automatic Winding

The Miyota 8285 automatically winds itself through the natural movement of your wrist while worn.

Manual Winding

If the watch has stopped:

  • Turn the crown clockwise approximately 30–40 times to sufficiently wind the mainspring.

  • The watch will then continue winding automatically while being worn.

Setting the Time

  1. Pull the crown to the second click.

  2. Turn the crown until the correct time is displayed.

  3. Push the crown back to the normal position.

Note: The Miyota 8285 does not feature hacking seconds, so the second hand will continue moving while setting the time.

Setting the Day & Date

  1. Pull the crown to the first click.

  2. Turn the crown in one direction to adjust the date.

  3. Turn the crown in the opposite direction to adjust the day.

  4. Push the crown back to the normal position after setting.

Important: Do not adjust the day or date between 9:00 PM and 4:00 AM, as the calendar mechanism may be engaged.

Care & Maintenance

  • Wear the watch regularly to keep the movement wound.

  • If not worn for several days, manually wind before use.

  • Avoid strong magnetic fields and severe impacts.

  • Keep the crown fully pushed in (or screwed down if applicable).

  • Professional servicing is recommended every 5–7 years, depending on usage and environmental conditions.

Why Choose the Miyota 8285?

  • Genuine Japanese automatic movement by Citizen's Miyota

  • Reliable day and date functionality

  • Efficient automatic and manual winding

  • Approximately 42-hour power reserve

  • Durable, dependable, and easy to service

  • Trusted in classic and everyday automatic watches

The Miyota 8285 is an excellent choice for those seeking a dependable Japanese automatic movement from one of the world's leading watch manufacturers, offering reliable performance, proven durability, and straightforward maintenance.