Grand Seiko Caliber 9F62A

Manufacturer	Grand Seiko
Caliber Number	9F62, 9F62A
In-House?	Yes
Accuracy Rating	+/-10 seconds per year
Battery Number	371 / 370 (SR920S / SR920SW)
Power Reserve	3 year battery life
Jewels	9
Functions	Central hours; central minutes; central seconds; date
Hacking Seconds?	Yes
Country of Manufacture	Made in Japan
Known Models	SBGX059 (Add your watch to the comments below…)

This example of the Seiko caliber 9F62A was found in a Grand Seiko model SBGX059.

There is also a caliber 9F61 that is basically the same with exception to the calendar feature.

This quartz movement is thermocompensated and adjusts for temperature variations.

Additional Resources:

• Official 9F62 instructions (pdf)
• Grand Seiko 9F62 review