The Seiko 4N21-0730 is a watch model based on the 4N21 movement.
Parts List
| 150A02SN02 | crystal - crystal |
| 6M30B9NNG0 | crown - crown |
| 0F140BAA3 | case back gasket - case back gasket |
| D017CB | band - band |
| D017BB | band - metal band |
| 3BA075F1BNG | others - second hand |
| 2BC060A1BNG | others - minute hand |
| 1BC042A1BNG | others - hour hand |
| 0351155 | others - winding stem |
| DZ0040B01 | others - crown and stem gasket |
| 81181459 | others - bracelet fixing pipe |
| 81604259 | others - bracelet fixing pin |
| 81604729 | others - bracelet fixing pin |
| 82833415 | others - case ring |
| 4N2107307NA | others - case |
| 4N210730 | others - case back |
| 4N21073075A | others - case |
| 4N211400XS14 | others - dial |
| 4N211410XG14 | others - dial |
| 4N2164 | others - machine code |
| 1BH042A1BNG | others - hour hand |
| 2BH060A1BNG | others - minute hand |