The Seiko D138-4009 is a watch model based on the D138 movement.
Parts List
| ES2W26GM01 | crystal |
| 0J3000N01 | case back gasket - case back gasket |
| EG0060B01 | others - button gasket |
Other models with the same movement
| D138-4000 |
| D138-4010 |
| D138-4020 |
| D138-5000 |
| D138-5010 |
| D138-5030 |
| D138-5040 |
| D138-5050 |