The Seiko W650-4040 is a watch model based on the W650 movement.
Parts List
| 0F300BED1 | case back gasket - case back gasket |
| 80632570 | pusher - front button |
| 80632479 | pusher - button (4h) |
| 80632499 | pusher - button |
| FCH6HZ | band - band |
| FCH5HZ | band - band |
| W6504040N2A | others - case |
| W6504040N2B | others - case |
| AD006BA11 | others - crown and stem gasket |
| 81518099 | others - case back screw |
| 81351639 | others - button spring |
| T180BS | others - push pin |
| 81334179 | others - button spring (front) |
| 83200211 | others - button spring clip |