Seiko 1421 Movement Details
Seiko caliber 1421 is an analog quartz watch movement produced from around 1980.
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| Sub-brands: | Fieldmaster, Exceline, Belfina, Socie, Laurier, Silverwave |
| Battery: | SR621SW / 364 (Silver oxide) |
| Accuracy: | ±15 seconds/month |
| Day / date? | No |
| GMT / world time? | No |
| Chronograph? | No |
| Hacking? | Yes |
| Rate: | 32,768 Hz |
| Number of jewels: | 2 |
| Size / diameter: | 15.1mm x 13.0mm |
| Height: | 2.8mm |
| Stem code: | 351144 |
| Screw codes: | 012155 (dial screw), 012170, 012171 |
| Development division: | Daini (Kameido, Tokyo) |
| Notes: | Has a battery life indicator function where the seconds hand moves in two-second intervals when the battery is running low. The same as cal. 1428 but with a central seconds hand instead of a small seconds sub-dial. |
| PDF guides: |
Technical guide for 1421A & 1428A
Parts list for 1421A |
| Related movements: | 1400 1428 |