The Seiko 4N21-0650 is a watch model based on the 4N21 movement.
Parts List
| 180P01SN03 | crystal |
| 6K30A1SNG0 | crown |
| 0F165BAA1 | case back gasket |
| 0F170BAA3 | case back gasket - case back gasket |
| AC004BAA1 | case back gasket - crown and stem gasket |
| 86566851 | crystal gasket - plastic gasket for crystal |
| KB04A | band - metal band |
| 3BA075F1BNG | others - second hand |
| A120BS | others - push pin (for lb) |
| 4N210650 | others - case back |
| 4N21065098 | others - case |
| 4N211270XS14 | others - dial |
| 4N2164 | others - machine code |
| 82841070 | others - case ring |
| 0351155 | others - winding stem |
| 07T37AGH | others - hour hand |
| 07T37AGM | others - minute hand |