The Seiko 4N20-0850 is a watch model based on the 4N20 movement.
Parts List
| 180A02JN02 | crystal - crystal |
| 6M25Z5NNGA | crown |
| 0F150BAA5 | case back gasket - case back gasket |
| 0H1700B01 | case back gasket - bezel gasket |
| DK21E | band - band |
| 2CA075A1BNG | others - minute hand |
| 82841070 | others - case ring |
| DZ0040B01 | others - crown and stem gasket |
| 4N2008507ZA | others - case |
| 4N200850 | others - case back |
| 4N2008507ZB | others - case |
| 4N2008507ZC | others - case |
| 4N201400XS14 | others - dial |
| 4N2061 | others - machine code |
| A110AS | others - push pin |
| 1CA050A1BNG | others - hour hand |