The Seiko 5P31-6D20 is a watch model based on the 5P31 movement.
Parts List
| 265W24SN02 | crystal |
| 35M82NA1 | crown - crown |
| 35M82NS1 | crown - crown |
| 0A2400B01 | case back gasket |
| AK03D | band - leather band |
| AK52C | band - leather band |
| 10T68AGH | others - hour hand |
| 82801940 | others - case ring |
| 5P316D20 | others - case back |
| 5P316D2075 | others - case |
| 5P316D207E | others - case |
| 5P316F00XS19 | others - dial |
| 5P316F10XS19 | others - dial |
| 5P319 | others - machine code |
| A170BS | others - push pin |
| 0351670 | others - winding stem |
| 10T98FGM | others - minute hand |
| 13SC04A2 | others - second hand |
| 13SC04ES | others - second hand |
| 10T98FSH | others - hour hand |
| 0Z0060B01 | others - crown and stem gasket |
| 10T98FSM | others - minute hand |