The Seiko 5Y31-5A50 is a watch model based on the 5Y31 movement.
Parts List
| REJN01JV01 | crystal |
| 30N97NN1 | crown |
| 0H2650B01 | case back gasket |
| DZ0065B01 | case back gasket - button gasket |
| B1581G | band - metal band |
| B1581G-BK5G | clasp - clasp |
| 3BA125F1BNG | others - second hand |
| A120BS | others - push pin (for lb) |
| 5Y315A50 | others - case back |
| 5Y315A5025 | others - case |
| 5Y315B50X994 | others - dial |
| 5Y315B50XL14 | others - dial |
| 82820430 | others - case ring |
| 08T01DGM | others - minute hand |
| 09SC31NG | others - second hand |
| 08T01DGH | others - hour hand |