The Seiko 4N20-0990 is a watch model based on the 4N20 movement.
Parts List
| 200WB9SK01 | crystal - crystal (inorganic) |
| 30M81DA5 | crown - crown |
| 0F170BA1S | case back gasket - case back gasket |
| AC004BA11 | case back gasket - crown and stem gasket |
| W026BB | band - band |
| 2CB060A1BNG | others - minute hand |
| 0351156 | others - winding stem |
| 81181459 | others - bracelet fixing pipe |
| 81611459 | others - bracelet fixing pin |
| 82832715 | others - case ring |
| 4N20099076A | others - case |
| 4N200990 | others - case back |
| 4N201610XA19 | others - dial |
| 4N2062 | others - machine code |
| 1CB047A1BNG | others - hour hand |