The Seiko W309-4180 is a watch model based on the W309 movement.
Parts List
| BA2W80LM01 | crystal |
| BA2W80LM02 | crystal |
| 86560320 | case back gasket - plastic gasket for case back |
| 86576620 | crystal gasket |
| 80605283 | pusher |
| 439MC | band - metal band |
| A200BS | others - push pin |
| W3090 | others - machine code |
| W309418062 | others - case |
| W309418062A | others - case |
| EG0060B01 | others - button gasket |
| 83200271 | others - button spring clip |