The Seiko F231-4000 is a watch model based on the F231 movement.
Parts List
| BA1N57KE40 | crystal |
| BA1N57KE50 | crystal |
| BA1N57KE10 | crystal |
| 0H2370B01 | case back gasket |
| DH0070B01 | case back gasket - crown and stem gasket |
Other models with the same movement
| F231-4009 |
| F231-4010 |
| F231-4019 |
| F231-4020 |
| F231-5000 |