Seiko 21 Movement Details
Seiko caliber 21 is a hand winding watch movement.
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| Sub-brands: | Sportslady |
| Day / date? | No |
| GMT / world time? | No |
| Chronograph? | No |
| Rate: | 19,800 bph |
| Number of jewels: | 17 |
| Size / diameter: | 17.8mm x 15.3mm |
| Height: | 3.5mm |
| Development division: | Daini (Kameido, Tokyo, Japan) |
| PDF guides: |
Technical guide
: 21A
Technical guide : 21C Technical guide : 21D |
| Related movements: | 2104 2118 |
Part Codes
| Stem code: | 351211 |
| Balance wheel code: | 310210 |
| Mainspring code: | 401210 |
| Screw codes: | 012102 (stud screw), 012107 (dial screw), 012121 (stud screw), 012210, 012214, 012254, 012303, 012502, 012604, 012707, 012807 |