The Seiko 4N20-5490 is a watch model based on the 4N20 movement.
Parts List
| SA2A09S20A | crystal - crystal |
| 6M35Y7SNGA | crown - crown |
| 6M35Y7SNWA | crown - crown |
| 6M35Y7NSWA | crown - crown |
| 0F140BA1S | case back gasket - case back gasket |
| D0J6AB | band - band |
| D0J6BB | band - band |
| D0J6CB | band - band |
| 81606439 | others - bracelet fixing pin |
| 81190055 | others - bracelet fixing pipe |
| 81606679 | others - bracelet fixing pin |
| 4N2054908WA | others - case |
| 82873370 | others - case ring |
| 4N2054908XA | others - case |
| 4N2054908YA | others - case |
| 4N201810XA15 | others - dial |
| 4N201810XA25 | others - dial |
| 4N2061 | others - machine code |
| DZ0040B01 | others - crown and stem gasket |
| 0351155 | others - winding stem |
| 1CC042LABDG | others - hour hand |
| 2CC060LABDG | others - minute hand |