The Seiko 4N20-0900 is a watch model based on the 4N20 movement.
Parts List
| 170A17SN02 | crystal |
| 6M30B5NNG1 | crown - crown |
| 0F140BAA3 | case back gasket - case back gasket |
| DK55E | band - leather band |
| DK56E | band - leather band |
| 0351155 | others - winding stem |
| DZ0040B01 | others - crown and stem gasket |
| 82840910 | others - case ring |
| 4N20090075 | others - case |
| 4N201450XG15 | others - dial |
| 4N201450XS15 | others - dial |
| 4N2061 | others - machine code |
| A110AS | others - push pin |
| 1CC042LABDG | others - hour hand |
| 2CC060LABDG | others - minute hand |