The Seiko W309-4210 is a watch model based on the W309 movement.
Parts List
| ESDW80LM01 | crystal - crystal |
| ESDW80LM02 | crystal |
| 86560320 | case back gasket - plastic gasket for case back |
| EA0090B0A | case back gasket - button gasket |
| 86575600 | crystal gasket |
| 80613169 | pusher |
| GA91B | band - band |
| W309421062 | others - case |
| A180CS | others - push pin |
| 81350480 | others - button spring |
| 81400623 | others - button spring clip |