The Seiko 4N21-0950 is a watch model based on the 4N21 movement.
Parts List
| SA2A01SN02 | crystal - crystal |
| 6M30B5SNW0 | crown - crown |
| 6M30B5NNG2 | crown - crown |
| 0F140BA1S | case back gasket - case back gasket |
| D0H7AQ | band - band |
| D0H7FQ | band - band |
| 1BH035A1BNG | others - hour hand |
| 1BH035A1BNS | others - hour hand |
| 3BA050F1BNG | others - second hand |
| 3BA050F1BNS | others - second hand |
| 2BH050A1BNG | others - minute hand |
| 2BH050A1BNS | others - minute hand |
| 0351155 | others - winding stem |
| DZ0040B01 | others - crown and stem gasket |
| 81606439 | others - bracelet fixing pin |
| 81190075 | others - bracelet fixing pipe |
| 4N21095075A | others - case |
| 82872670 | others - case ring |
| 4N210950 | others - case back |
| 4N2109507EA | others - case |
| 4N211960XS14 | others - dial |
| 4N211970XL13 | others - dial |
| 4N2164 | others - machine code |