The Seiko 4N21-0850 is a watch model based on the 4N21 movement.
Parts List
| 190WC9SN01 | crystal |
| 6M35Y3SNA0 | crown |
| 6M35Y3SNW0 | crown - crown |
| 6M35Y3NNG0 | crown - crown |
| 0F160BAA5 | case back gasket - case back gasket |
| D056AG | band - metal band |
| DAR0DW | band - leather band |
| DAR2EW | band - leather band |
| 3BA075F1BNG | others - second hand |
| 3BA075F1BNS | others - second hand |
| 2BA080A5BNS | others - minute hand |
| A120BS | others - push pin (for lb) |
| 4N210850 | others - case back |
| 4N21085075A | others - case |
| 4N21085079A | others - case |
| 4N210850WEA | others - case |
| 4N211690XB1Z | others - dial |
| 4N211690XS1Z | others - dial |
| 4N211700XS19 | others - dial |
| 4N211710XS13 | others - dial |
| 4N2164 | others - machine code |
| 82833515 | others - case ring |
| DZ0040B01 | others - crown and stem gasket |
| 0351155 | others - winding stem |
| 1BA050A5BNS | others - hour hand |
| 1BB050A6BNG | others - hour hand |
| 1BF052A1BNS | others - hour hand |
| 2BA075A0BNG | others - minute hand |
| 2BF075A1BNS | others - minute hand |
| 3AX115F5ANS | others - second hand |