The Seiko W620-4004 is a watch model based on the W620 movement.
Parts List
| 0F300BAA1 | case back gasket - case back gasket |
| 80637899 | pusher - button(10h) |
| 80637930 | pusher - button (2h) |
| 80637910 | pusher - front button |
| 80637879 | pusher - button (8h) |
| 8AP9JZ | band |
| AD006BA11 | others - crown and stem gasket |
| 83200211 | others - button spring clip |