The Seiko 4N20-5020 is a watch model based on the 4N20 movement.
Parts List
| ESFW07SR01 | crystal |
| 27M19NA1 | crown - crown |
| 27M19NS1 | crown |
| 0F130BAA3 | case back gasket - case back gasket |
| ZB14A | band - metal band |
| ZB15A | band - metal band |
| DZ0040B01 | others - crown and stem gasket |
| 0351155 | others - winding stem |
| 4N200120XN19 | others - dial |
| 4N200120XS19 | others - dial |
| 4N205020 | others - case back |
| 4N205020SA | others - case |
| 4N205020WH | others - case |
| 4N2061 | others - machine code |
| 81102239 | others - pipe |
| 82833130 | others - case ring |
| T070BS | others - push pin |
| 04Y05DGM | others - minute hand |
| 2CA045A3BDG | others - minute hand |
| 04Y05NGH | others - hour hand |