The Seiko 5P31-6D40 is a watch model based on the 5P31 movement.
Parts List
| 255W12SN02 | crystal |
| 35M82NA1 | crown - crown |
| 35M82NS1 | crown - crown |
| 0A2400B01 | case back gasket |
| AK05D | band - leather band |
| AK06D | band - leather band |
| AK07D | band - leather band |
| YA56A | band - metal band |
| 82801940 | others - case ring |
| 5P316D40 | others - case back |
| 5P316D4075 | others - case |
| 5P316D407E | others - case |
| 5P316F40XB13 | others - dial |
| 5P316F50XS13 | others - dial |
| 5P316F50XS24 | others - dial |
| 5P316F50XS34 | others - dial |
| 5P319 | others - machine code |
| A170BS | others - push pin |
| 0351670 | others - winding stem |
| 10T50AAH | others - hour hand |
| 10T50AAM | others - minute hand |
| 13SC04A2 | others - second hand |
| 13SC04ES | others - second hand |
| 0Z0060B01 | others - crown and stem gasket |
| 10T50ANH | others - hour hand |
| 10T50ANM | others - minute hand |
| 10T50NSH | others - hour hand |
| 10T50NSM | others - minute hand |