The Seiko 1231-5009 is a watch model based on the 1231 movement.
Parts List
| ES6W85SN00 | crystal |
| 25M15DA1 | crown - crown |
| 0Z0034B01 | case back gasket - crown and stem gasket |
| 0F180BAA3 | case back gasket |
Caliber 1231
Other models with the same movement
| 1231-0018 |
| 1231-0019 |
| 1231-0029 |
| 1231-0039 |
| 1231-0049 |
| 1231-5019 |
| 1231-5029 |
| 1231-5039 |
| 1231-5049 |