The Seiko 5Y31-5B09 is a watch model based on the 5Y31 movement.
Parts List
| RE8N83JN00 | crystal |
| RE8N83JN | crystal |
| 32M25NN1 | crown |
| 0F240BAA3 | case back gasket - case back gasket |
| 0F240BAA | case back gasket |
| G1330G | band |
| G1330G-BK5G | clasp - clasp |
| 1BA060A1BNG | others - hour hand |
| 09SC27NG | others - second hand |
| 3BA125F1BNG | others - second hand |
| EB0055B01 | others - crown and stem gasket |
| 0351671 | others - winding stem |
| 5Y315B09 | others - case back |
| 5Y315B0975 | others - case |
| 5Y315C40XG14 | others - dial |
| 82820870 | others - case ring |
| A160BS | others - push pin |
| 09T13NGH | others - hour hand |
| 09T13NGM | others - minute hand |
| 2BA090A1BNG | others - minute hand |