The Seiko W903-4000 is a watch model based on the W903 movement.
Parts List
| ES8W34LM01 | crystal |
| 0K5500B41 | case back gasket - case back gasket |
| EZ0121B01 | case back gasket |
| 86572060 | crystal gasket |
| EZ0550N41 | pusher - button gasket |
| 099LD | band |
| 0K0700B01 | others |