The Seiko W620-4100 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) |
| FCE5AB | band - band |
| FCE6AB | band - band |
| T180CS | others - push pin |
| W6204100N2A | others - case |
| W6204100N2B | others - case |
| 81351630 | others - button spring |
| AD006BA11 | others - crown and stem gasket |
| 81334179 | others - button spring (front) |
| 81350760 | others - button spring (front) |
| 81518099 | others - case back screw |
| 83200211 | others - button spring clip |