The Seiko 4N21-0130 is a watch model based on the 4N21 movement.
Parts List
| 185W63SE01 | crystal |
| 185W63SE02 | crystal |
| 25M69NA1 | crown |
| 0H1700B01 | case back gasket - bezel gasket |
| 0F160BAA5 | case back gasket - case back gasket |
| Z5385 | band - metal band |
| Z5386 | band - metal band |
| Z5387 | band - metal band |
| 81181459 | others - bracelet fixing pipe |
| 81607199 | others - bracelet fixing pin |
| 82840695 | others - case ring |
| 4N210130 | others - case back |
| 4N2101306Y | others - case |
| 4N210130PL | others - case |
| 4N210130XH | others - case |
| 4N210240XN14 | others - dial |
| 4N210240XS14 | others - dial |
| 4N2164 | others - machine code |
| DZ0040B01 | others - crown and stem gasket |
| 0351156 | others - winding stem |
| 08T93JGM | others - minute hand |
| 1BB055A1BAX | others - hour hand |
| 08SC55VG | others - second hand |
| 2BB080A1BDG | others - minute hand |