The Seiko 5Y31-7A30 is a watch model based on the 5Y31 movement.
Parts List
| 280WB1JN01 | crystal |
| 280A03JN02 | crystal - crystal (inorganic) |
| 280WB1JN | crystal |
| 280A03JN | crystal |
| 32M69NN1 | crown |
| 0F230BAA | case back gasket |
| 0F230BAA3 | case back gasket - case back gasket |
| WPJ51G | band |
| WPA36G | band |
| 11SC41T1 | others - second hand |
| 3AA125F1ANG | others - second hand |
| 12SC39T1 | others - second hand |
| EB0055B01 | others - crown and stem gasket |
| 0351671 | others - winding stem |
| 10T09DGH | others - hour hand |
| 10T09DGM | others - minute hand |
| 2BA115A1BNG | others - minute hand |
| 11T03NGM | others - minute hand |
| 1BA080A1BNG | others - hour hand |
| 12T07NGH | others - hour hand |