The Seiko W309-4090 is a watch model based on the W309 movement.
Parts List
| ES8W70LM01 | crystal |
| EA0091B0A | case back gasket |
| 86575920 | crystal gasket - plastic gasket for crystal |
| 0Z2900B01 | bezel gasket - dichtung |
| 097LD | band - leather band |
| A170CS | others - push pin |