The Seiko 4N20-0040 is a watch model based on the 4N20 movement.
Parts List
| 160A02SN01 | crystal - crystal |
| 160W17SN01 | crystal - crystal (sapphire) |
| 27M01DA4 | crown |
| AC004BA11 | case back gasket - crown and stem gasket |
| 0F140BAA3 | case back gasket - case back gasket |
| DZ10B | band - metal band |
| DZ11B | band - metal band |
| 81181459 | others - bracelet fixing pipe |
| 81604259 | others - bracelet fixing pin |
| 06Y49JGH | others - hour hand |
| 4N200040 | others - case back |
| 4N20004075A | others - case |
| 4N2000407NA | others - case |
| 4N200180XB14 | others - dial |
| 4N200180XS14 | others - dial |
| 4N2061 | others - machine code |
| 82833410 | others - case ring |
| 0351155 | others - winding stem |
| 06Y49JGM | others - minute hand |
| 1CC042LABDG | others - hour hand |
| 2CC060LABDG | others - minute hand |