The Seiko 5P31-800B is a watch model based on the 5P31 movement.
Parts List
| 290W89HN01 | crystal - crystal |
| 35M27NA1 | crown |
| 0F240BAA3 | case back gasket - case back gasket |
| LK09G | band - band |
| 3AA125F3ANG | others - second hand |
| 1BA085A1BAF | others - hour hand |
| 2BA120A1BAF | others - minute hand |
| 82810490 | others - case ring |
| EB0055B01 | others - crown and stem gasket |
| 5P31800B75 | others - case |
| 5P31800B | others - case back |
| 5P3161 | others - machine code |
| 5P318110XG14 | others - dial |
| A170BS | others - push pin |