The Seiko W820-4020 is a watch model based on the W820 movement.
Parts List
| 290PX5LN03 | crystal - crystal |
| 0F340BAA1 | case back gasket - case back gasket |
| 86587250 | crystal gasket - plastic gasket for crystal |
| 80637731 | pusher - button |
| 80637739 | pusher - button |
| 80637751 | pusher - button |
| FAZ7AZ | band - band |
| FAZ8AZ | band - band |
| FAZ6AZ | band - band |
| WL75AZ | band - band |
| WL76AZ | band - band |
| FAZ9AZ | band - leather band |
| FB60AZ | band - leather band |
| A170CS | others - push pin |
| W8204020N2G | others - case |
| W8204020 | others - case back |
| W8204020N2H | others - case |
| W8204020N2F | others - case |
| W8204020N2B | others - case |
| W8204020N2C | others - case |
| 83200273 | others - button spring clip |
| AD006BA11 | others - crown and stem gasket |
| 81354210 | others - button spring |
| 81518099 | others - case back screw |
| 81518259 | others - case back screw |
Other models with the same movement