The Seiko 4N21-5230 is a watch model based on the 4N21 movement.
Parts List
| ESDW37JN01 | crystal |
| 6M30B5NNG1 | crown - crown |
| 0F160BAA5 | case back gasket - case back gasket |
| DS50A | band - metal band |
| DS51A | band - metal band |
| 3BA075F1BNG | others - second hand |
| 1BA045A1BNG | others - hour hand |
| 1BC047A1BNG | others - hour hand |
| 2BC070A1BNG | others - minute hand |
| DZ0040B01 | others - crown and stem gasket |
| 0351155 | others - winding stem |
| 4N211550XG14 | others - dial |
| 4N211560XS14 | others - dial |
| 4N211890XE19 | others - dial |
| 4N215230 | others - case back |
| 4N21523075A | others - case |
| 4N2152307NA | others - case |
| 4N2164 | others - machine code |
| 82863210 | others - case ring |
| A100AS | others - push pin |
| 2BA067A1BNG | others - minute hand |