The Seiko 5Y31-6A30 is a watch model based on the 5Y31 movement.
Parts List
| 270W99LM01 | crystal |
| 270W99LM | crystal |
| 35MK9NA1 | crown |
| DH0100B01 | case back gasket - crown and stem gasket (4h) |
| DH0100B0 | case back gasket |
| FE278BA11 | case back gasket - case back gasket |
| 86590190 | crystal gasket |
| ZPZ26G | band |
| 2BA120A1BNG | others - minute hand |
| 3AA125F1ANG | others - second hand |
| 12SC39T1 | others - second hand |
| 0351671 | others - winding stem |
| 82733090 | others - case ring |
| 5Y316A30 | others - case back |
| 5Y316A30WE | others - case |
| 5Y316A40XB14 | others - dial |
| A150BS | others - push pin |
| 12T07NGM | others - minute hand |
| 1BA080A1BNG | others - hour hand |
| 12T07NGH | others - hour hand |