Seiko 2B21 Movement Details
Seiko caliber 2B21 is an analog quartz watch movement. Production was in the 1980s.
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| Sub-brands: | Seiko 5 |
| Battery: | SR521SW / 379 (Silver oxide) |
| Accuracy: | ±20 seconds/month |
| Day / date? | No |
| GMT / world time? | No |
| Chronograph? | No |
| Number of jewels: | 1 |
| Size / diameter: | 15.1mm |
| Height: | 2.4mm |
| Development division: | Daini (Kameido, Tokyo, Japan) |
| Notes: | Used in ladies watches. |
| PDF guides: | Technical guide : 2B21A |
| Related movements: | 2B20 2B31 |
Part Codes
| Stem code: | 354235 |
| Screw codes: | 012010, 012024, 012495, 012818, 012819 |