The Seiko W680-4020 is a watch model based on the W680 movement.
Parts List
| 0F360BAD1 | case back gasket - case back gasket |
| EC045BA13 | case back gasket - gasket |
| 80632719 | pusher - button |
| 80632711 | pusher - button |
| FCF7HE | band - band |
| FCF8HE | band - band |
| W6804020N2B | others - case |
| T200BS | others - push pin |
| W6804020N2A | others - case |
| 81614010 | others - pin |
| AD006BA11 | others - crown and stem gasket |
| 81518099 | others - case back screw |
| 81351639 | others - button spring |
| 83200211 | others - button spring clip |
Other models with the same movement
| W680-4000 |
| W680-4010 |
| W680-4030 |
| W680-4040 |
| W680-4060 |
| W680-4070 |