Seiko Caliber 7C46

Manufacturer	Seiko
Caliber Number	7C46, 7C46A
Movement Type	Quartz
Diameter	28.6mm overall (27mm between 3:00 and 9:00)
Height	3.7mm
Jewels	7
Frequency	32,768 Hz
Battery Cell	SR43SW (301)
Battery Life	5 years
Accuracy Rating	Less than +/- 15 seconds/month
Driving System	Step motor with load compensated driving pulse type
Integrated Circuit	C-MOS-IC
Regulator?	Yes (pattern cutting system
Hand Count	3
Functions	Central hours; central minutes; central seconds; day/date at 3:00
Hacking Seconds?	Yes
Country of Manufacture	Made in Japan
Known Models	Seiko Tuna (Ref: SBDS018, SSBS018) (Add your watch to the comments below…)

The Seiko caliber 7C46 is a quartz watch movement with a long battery life, high torque and a rate trimmer for regulating to precise accuracy.

Official Tech Sheets (pdf):

Additional Resources:

• Official Seiko instruction manual (pdf)

Note: This caliber listing is still being updated, but feel free to start discussions on it in the comments below…