The Seiko 5P31-6A90 is a watch model based on the 5P31 movement.
Parts List
| 260N16HK01 | crystal - crystal |
| 35MF8NS1 | crown |
| 0H2520N01 | case back gasket - case back gasket |
| LK62C | band - leather band |
| A130AS | others - push pin (for lb) |
| 5P316A90 | others - case back |
| 5P316A904C | others - case |
| 5P316C10XS19 | others - dial |
| 5P319 | others - machine code |
| 82803000 | others - case ring |
| 0351670 | others - winding stem |
| 10T68ARH | others - hour hand |
| 10T68ARM | others - minute hand |
| 13SC04AB | others - second hand |
| 0Z0060B01 | others - crown and stem gasket |