The Seiko 5P31-7A20 is a watch model based on the 5P31 movement.
Parts List
| 280WB6HK01 | crystal |
| 40M78NK1 | crown - crown |
| 0A2600N0A | case back gasket |
| 86177922 | crystal gasket - plastic gasket for crystal |
| GK24B | band - leather band |
| 82802780 | others - case ring |
| 5P317A1LXB19 | others - dial |
| 5P317A20 | others - case back |
| 5P317A2061 | others - case |
| 5P319 | others - machine code |
| A170BS | others - push pin |
| 0351670 | others - winding stem |
| 11TB0MKH | others - hour hand |
| 11TB0MKM | others - minute hand |
| 0Z0060B01 | others - crown and stem gasket |
| 13SC04XW | others - second hand |