The Seiko 5E31-5B90 is a watch model based on the 5E31 movement.
Parts List
| ESCW46SJ01 | crystal |
| ESCW46SJ02 | crystal |
| 30MG8NA4 | crown - crown |
| 0F270NA1S | case back gasket - case back gasket |
| DA54BW | band - leather band |
| 10ST04DG | others - second hand |
| 0351624 | others - winding stem |
| 82835660 | others - case ring |
| 5E315 | others - machine code |
| 5E315B90 | others - case back |
| 5E315B9075 | others - case |
| 5E315B907N | others - case |
| 5E315C30XG14 | others - dial |
| 5E315C40XB14 | others - dial |
| 87020283 | others - back plate |
| A200BS | others - push pin |
| EZ0035B01 | others - crown and stem gasket |
| 1BF065L0BDG | others - hour hand |
| 2BF095L0BDG | others - minute hand |