The Seiko 5Y31-5B40 is a watch model based on the 5Y31 movement.
Parts List
| REJN23JV01 | crystal |
| REJN23JV | crystal |
| 30N97NN1 | crown |
| DZ0065B0 | case back gasket |
| 0H2650B0 | case back gasket |
The Seiko 5Y31-5B40 is a watch model based on the 5Y31 movement.
| REJN23JV01 | crystal |
| REJN23JV | crystal |
| 30N97NN1 | crown |
| DZ0065B0 | case back gasket |
| 0H2650B0 | case back gasket |