The Seiko 5Y31-5A30 is a watch model based on the 5Y31 movement.
Parts List
| REJN15JN01 | crystal |
| REJN15JN | crystal |
| 30N97NN1 | crown |
| 0H2700B0 | case back gasket |
| 0H2700B01 | case back gasket - case back gasket |
| DZ0065B01 | case back gasket - button gasket |
| BPA68G | band - leather band |
| BPJ70G | band - leather band |
| BPA67G | band |
| BPJ69G | band |
| 2BA085A3BNG | hand - minute hand |
| 07SC43NG | others - second hand |
| 3BA075F1BNG | others - second hand |
| 3BA125F1BNG | others - second hand |
| 1BE055LABDG | others - hour hand |
| 08T01DGM | others - minute hand |
| 0351671 | others - winding stem |
| 5Y315A30 | others - case back |
| 5Y315A3025 | others - case |
| 5Y315A50XB14 | others - dial |
| 5Y315A80XB14 | others - dial |
| 5Y315A80XG14 | others - dial |
| 5Y315A90XS19 | others - dial |
| 5Y315B00XS14 | others - dial |
| 5Y315B10XG14 | others - dial |
| 5Y315B10XL14 | others - dial |
| 5Y315D70XG14 | others - dial |
| 5Y315D80XS14 | others - dial |
| 5Y3161 | others - machine code |
| 82820290 | others - case ring |
| A180BS | others - push pin |
| 09SC31NG | others - second hand |
| 08T01DGH | others - hour hand |
| 2BE085LABDG | others - minute hand |
| 2BA085A3BDG | others - minute hand |
| 2BC085A1BAA | others - minute hand |
| 07T01DGM | others - minute hand |
| 08T45AGM | others - minute hand |
| 08T03DGM | others - minute hand |
| 1BA055A3BNG | others - hour hand |
| 08T03DGH | others - hour hand |
| 07T01DGH | others - hour hand |
| 1BC060A1BAA | others - hour hand |
| 08T45AGH | others - hour hand |