The Seiko W309-4009 is a watch model based on the W309 movement.
Parts List
| 280W76LM01 | crystal |
| 280W76LM02 | crystal |
| FH2882B0A | case back gasket - case back gasket |
| EG0115B01 | case back gasket - button gasket |
| 86575625 | crystal gasket - plastic gasket for crystal |
| 80600363 | pusher |
| 001BA | band - metal band |
| A160BS | others - push pin |
| W3090 | others - machine code |
| W30940096KA | others - case |