The Seiko 5Y31-6A40 is a watch model based on the 5Y31 movement.
Parts List
| 230W21HK01 | crystal |
| 30MC7NH1 | crown |
| 30MC7NK1 | crown |
| 0F200BAA3 | case back gasket - case back gasket |
| LK38D | band - leather band |
| LK39D | band - leather band |
| 3BA125F1BNG | others - second hand |
| 3BA125F1BNS | others - second hand |
| 0D005BA13 | others - crown and stem gasket |
| 0351671 | others - winding stem |
| 5Y3161 | others - machine code |
| 5Y316A40RC | others - case |
| 5Y316A40RE | others - case |
| 5Y316A50X914 | others - dial |
| 5Y316A50X923 | others - dial |
| 82801390 | others - case ring |
| A170BS | others - push pin |
| 09T43AGH | others - hour hand |
| 09T43AGM | others - minute hand |
| 09T57ASH | others - hour hand |
| 09T57ASM | others - minute hand |
| 10SC27NG | others - second hand |
| 10SC27NS | others - second hand |
| 1BC060A1BAA | others - hour hand |