The Seiko W620-4A20 is a watch model based on the W620 movement.
Parts List
| 0G310BA16 | bezel gasket - case back gasket |
| A35A10SMS0A | pusher - button |
| HM0Z10PAB0A | pusher - front button |
| HM0Z10PAZ0A | pusher - front button |
| FE20JB | band - band |
| FE19JB | band - band |
| W6204A20N2X | others - case |
| W6204A20N2Y | others - case |
| W6204A20N2Z | others - case |
| T180CS | others - push pin |
| 81351639 | others - button spring |
| AD006BA11 | others - crown and stem gasket |
| 83200219 | others - button spring clip |
| 81350700 | others - button spring (front) |