The Seiko 4N21-0630 is a watch model based on the 4N21 movement.
Parts List
| 185A02S20A | crystal - crystal |
| 185A02S20B | crystal - crystal |
| 25M69NS1 | crown - crown |
| 25M69NA1 | crown |
| 0F150BAA5 | case back gasket - case back gasket |
| 0H1700B01 | case back gasket - bezel gasket |
| HB13B | band - band |
| W012CZ | band - band |
| W013AZ | band - band |
| 2BB070A1BNG | others - minute hand |
| 3BA075F1BNG | others - second hand |
| 0351155 | others - winding stem |
| DZ0040B01 | others - crown and stem gasket |
| 81606439 | others - bracelet fixing pin |
| 81181459 | others - bracelet fixing pipe |
| 81607559 | others - bracelet fixing pin |
| 82832995 | others - case ring |
| 4N21063061 | others - case |
| 4N210630 | others - case back |
| 4N21063061B | others - case |
| 4N210630SFA | others - case |
| 4N211200XS24 | others - dial |
| 4N211200XS34 | others - dial |
| 4N2164 | others - machine code |
| 1BB050A1BNG | others - hour hand |