The Seiko 4N20-0490 is a watch model based on the 4N20 movement.
Parts List
| 180A02SN02 | crystal - crystal (sapphire) |
| 30M57NA1 | crown - crown |
| 0H1700B01 | case back gasket - bezel gasket |
| 0F160BAA5 | case back gasket - case back gasket |
| AC004BA11 | case back gasket - crown and stem gasket |
| ZB34A | band - metal band |
| 82833515 | others - case ring |
| 4N200490 | others - case back |
| 4N20049098 | others - case |
| 4N200800XS19 | others - dial |
| 4N2061 | others - machine code |
| 81116579 | others - pipe |
| 82351791 | others - bezel |
| T060AS | others - push pin |
| 0351155 | others - winding stem |
| 1CF050L0BDG | others - hour hand |
| 07Y41DGH | others - hour hand |
| 07Y41DGM | others - minute hand |
| 2CF075LABDG | others - minute hand |