The Seiko 4N21-5030 is a watch model based on the 4N21 movement.
Parts List
| K00W71JN01 | crystal |
| 30M57NA1 | crown - crown |
| 0F150BAA5 | case back gasket - case back gasket |
| AC004BA11 | case back gasket - crown and stem gasket |
| DK12D | band - leather band |
| 3BA075F1BNG | others - second hand |
| 07SC43NG | others - second hand |
| 4N210150XG14 | others - dial |
| 4N215030 | others - case back |
| 4N21503075 | others - case |
| 4N2160 | others - machine code |
| 82833210 | others - case ring |
| A100AS | others - push pin |
| 0351155 | others - winding stem |
| 07T07DGM | others - minute hand |
| 1BA047A1BNG | others - hour hand |
| 2BA070A1BDG | others - minute hand |
| 2BA070A1BNG | others - minute hand |