The Seiko 4N21-1000 is a watch model based on the 4N21 movement.
Parts List
| 170A23JN02 | crystal - crystal |
| 6M30A3NNG1 | crown - crown |
| 0H1700B01 | case back gasket - bezel gasket |
| D0S1CB | band - band |
| D0S1FB | band - band |
| 3BA075F1BNG | others - second hand |
| 1BC045A1BAA | others - hour hand |
| 1BC045A1BNG | others - hour hand |
| 2BC065A1BNG | others - minute hand |
| DZ0040B01 | others - crown and stem gasket |
| 0351155 | others - winding stem |
| 81606439 | others - bracelet fixing pin |
| 81190055 | others - bracelet fixing pipe |
| 81606679 | others - bracelet fixing pin |
| 4N2110007HA | others - case |
| 82835690 | others - case ring |
| 4N211000 | others - case back |
| 4N212140XS14 | others - dial |
| 4N212170XS19 | others - dial |
| 4N2164 | others - machine code |
| 2BC065A1BAA | others - minute hand |