The Seiko 5Y31-5A8A is a watch model based on the 5Y31 movement.
Parts List
| REJN07JV02 | crystal |
| REJN07JV | crystal |
| 30N97NN1 | crown |
| 0H2650B01 | case back gasket |
| 0H2650B0 | case back gasket |
| DZ0065B01 | case back gasket - button gasket |
| B1579G | band |
| M1032G | band |
| B1579G-BK5G | clasp - clasp |
| 3BA125F1BNG | others - second hand |
| A120BS | others - push pin (for lb) |
| 5Y315A80 | others - case back |
| 5Y315A8A | others - case back |
| 5Y315A8A25 | others - case |
| 5Y315B90XB14 | others - dial |
| 82820430 | others - case ring |
| 0351671 | others - winding stem |
| 09SC31NG | others - second hand |
| 2BA085A3BDG | others - minute hand |
| 08T17DGM | others - minute hand |
| 08T03DGM | others - minute hand |
| 08T17DGH | others - hour hand |
| 1BA055A3BNG | others - hour hand |
| 08T03DGH | others - hour hand |