The Seiko S321-4000 is a watch model based on the S321 movement.
Parts List
| ES6W46GM01 | crystal |
| 0K5500B41 | case back gasket - case back gasket |
| EZ0121B01 | case back gasket |
| 86572060 | crystal gasket |
| 80614800 | pusher |
| EZ0550N41 | pusher - button gasket |
| 80614820 | pusher - (front button) |
| 80680689 | pusher - button axle |
| BZA04N | band - band |
| AN15A | band - other band |
| 81502209 | others - case back screw |
| 81502389 | others - screw |
| 81871069 | others - case bow |
| 95020240 | others - switch |
| 95020260 | others - switch |
| S3211 | others - machine code |
| S3214000N0 | others - case |
| 0K0700B01 | others |
Other models with the same movement