This manual describes how to use the SEIKO Analogue Quartz Watch Cal. 4F56/8F56.
This manual provides step‑by‑step instructions for operating the Seiko Cal. 4F56/8F56 analogue quartz watch. It explains how to set the time, date, dual‑time and world‑time displays, adjust for time‑zone differences while traveling, and use the perpetual calendar function.
Additional sections cover battery replacement, safety warnings, and detailed technical specifications such as crystal frequency, temperature range, and motor types. The guide also includes notes on proper care and troubleshooting tips.
| Crystal oscillator frequency | 196,608 Hz |
|---|---|
| Annual rate (loss/gain) | ±20 seconds |
| Operational temperature range | –10 °C to +60 °C |
| Driving system | Step motor for time, ultrasonic motor for calendar |
| Battery type | SEIKO CR1612 (Cal. 4F56) / SEIKO CR2412 (Cal. 8F56) |
| Magnetic resistance | 4,800 A/m (60 gauss) |
The miniature battery should last about 5 years for the Cal. 4F56 and about 10 years for the Cal. 8F56, though actual life may be shorter under certain conditions.
Contact an authorized Seiko dealer and request a SEIKO CR1612 battery for the Cal. 4F56 or a SEIKO CR2412 battery for the Cal. 8F56.