The Seiko 3F31-0A40 is a watch model based on the 3F31 movement.
Parts List
| 180W46SN02 | crystal |
| 30MK8NA4 | crown - crown |
| 0A1800N01 | case back gasket |
| DB29B | band - metal band |
| 07SC06DG | others - second hand |
| 81606439 | others - bracelet fixing pin |
| 81182699 | others - bracelet fixing pipe |
| 0354735 | others - winding stem |
| 82832280 | others - case ring |
| 3F310A40 | others - case back |
| 3F310A40SA | others - case |
| 3F310A60X914 | others - dial |
| 3F311 | others - machine code |
| EZ0035B01 | others - crown and stem gasket |
| 1AB050L2BCD | others - hour hand |
| 2AB070L0BCD | others - minute hand |