The Seiko 4N20-5390 is a watch model based on the 4N20 movement.
Parts List
| ES2A65SN02 | crystal |
| 6M30B5SNW0 | crown - crown |
| 6M30B5NNG1 | crown - crown |
| 0H1400B01 | case back gasket - case back gasket |
| DZ54B | band - metal band |
| DZ55B | band - metal band |
| 04Y35JCH | others - hour hand |
| DZ0040B01 | others - crown and stem gasket |
| 0351155 | others - winding stem |
| 81182699 | others - bracelet fixing pipe |
| 81609399 | others - bracelet fixing pin |
| 81609559 | others - bracelet fixing pin |
| 82861870 | others - case ring |
| 4N201340XA15 | others - dial |
| 4N205390 | others - case back |
| 4N20539026 | others - case |
| 4N2053902E | others - case |
| 4N2061 | others - machine code |
| 04Y35JGM | others - minute hand |