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