The Seiko 5P31-6A20 is a watch model based on the 5P31 movement.
Parts List
| 270W20HM01 | crystal - crystal |
| 35M82NS1 | crown - crown |
| 0A2400N01 | case back gasket - case back gasket |
| 86580140 | crystal gasket |
| AA59B | band - band |
| 11T08NSH | others - hour hand |
| 11T10NSM | others - minute hand |
| 82801940 | others - case ring |
| 5P316A2061 | others - case |
| 5P316A20 | others - case back |
| 5P316A40XS13 | others - dial |
| 5P319 | others - machine code |
| A150BS | others - push pin |
| 0351670 | others - winding stem |
| 13SC04ES | others - second hand |
| 0Z0060B01 | others - crown and stem gasket |