The Seiko 4N20-0540 is a watch model based on the 4N20 movement.
Parts List
| 180A02SN02 | crystal - crystal (sapphire) |
| 25M25NA4 | crown |
| 0F150BAA5 | case back gasket - case back gasket |
| DK60D | band - band |
| DK59D | band - band |
| 07Y39JCH | others - hour hand |
| 07Y39JGM | others - minute hand |
| 82832995 | others - case ring |
| 4N2005407NA | others - case |
| 4N200540 | others - case back |
| DZ0040B01 | others - crown and stem gasket |
| 0351155 | others - winding stem |
| 4N200950XG19 | others - dial |
| 4N200950XS19 | others - dial |
| 4N2061 | others - machine code |
| A110AS | others - push pin |