Seiko 8R28 mechanical watch user manual with operation, setting, maintenance and specifications.
This manual explains the features and parts of the Seiko 8R28 mechanical watch, how to operate it, set the time and date, use the stopwatch, and protect its quality. It also covers storage recommendations, major repair information, warranty and service details, troubleshooting, accuracy explanations, and technical specifications.
The guide provides step‑by‑step instructions for winding the mainspring, adjusting the crown, setting the date and time, using the stopwatch, and caring for the watch to maintain its precision and durability. This manual is written in Chinese.
| Vibration frequency | 28,800 per hour |
|---|---|
| Maximum stopwatch timing | 12 hours |
| Operating duration | 45 hours or more |
| Drive system | Automatic winding with manual winding device |
| Number of jewels | 34 |
| Operating temperature range | 5 °C – 35 °C |
Rotate the crown clockwise (about 20 turns) to wind the mainspring; if the watch has stopped, turn the crown manually to fully wind it.
The stopwatch can continuously time up to 12 hours.