The Seiko 4N00-0900 is a watch model based on the 4N00 movement.
Parts List
| 180A02JN02 | crystal - crystal |
| 170A02JN02 | crystal - crystal |
| 6M30B5NNG0 | crown - crown |
| 6M30B5NN | crown |
| 0H1600B01 | case back gasket - case back gasket |
| 0H1600B0 | case back gasket |
| WFA33G | band |
| WFJ41G | band - leather band |
| WFJ40G | band |
| 1CE045L2BDG | others - hour hand |
| 2CE065L2BDG | others - minute hand |
| A100BS | others - push pin (for mb) |
| 4N000900 | others - case back |
| 4N00090025 | others - case |
| 4N0009002H | others - case |
| 4N003210XB14 | others - dial |
| 4N003210XG14 | others - dial |
| 4N003210XS14 | others - dial |
| 4N003220XS14 | others - dial |
| 4N0061 | others - machine code |
| DZ0040B01 | others - crown and stem gasket |
| 82841030 | others - case ring |
| 0351155 | others - winding stem |
| 1CC045A1BAA | others - hour hand |
| 2CC065A1BAA | others - minute hand |