The Seiko 3F31-004A is a watch model based on the 3F31 movement.
Parts List
| 185A02SN02 | crystal |
| 25M25DA5 | crown - crown (3h) |
| 0H1700B01 | case back gasket - bezel gasket |
| 0F160BAA5 | case back gasket - case back gasket |
| DB45B | band - band |
| 1AF047L1BDG | others - hour hand |
| 2AF070L1BDG | others - minute hand |
| 81606439 | others - bracelet fixing pin |
| 81181459 | others - bracelet fixing pipe |
| 82833100 | others - case ring |
| DZ0040B01 | others - crown and stem gasket |
| 3F31004ASFA | others - case |
| 3F31004A | others - case back |
| 3F31004ASFB | others - case |
| 3F31004ASFC | others - case |
| 3F31004ASFD | others - case |
| 3F310090XS14 | others - dial |
| 3F311 | others - machine code |
| 3DA070AABDG | others - second hand |