The Seiko 3F31-0B80 is a watch model based on the 3F31 movement.
Parts List
| 180P06SN02 | crystal - crystal |
| 6K35A0STGA | crown - crown |
| 0F180NAAS | case back gasket - case back gasket |
| 86580060 | crystal gasket - plastic gasket for crystal |
| D031CB | band - band |
| 07SC06DG | others - second hand |
| 81180229 | others - bracelet fixing pipe |
| 81602669 | others - bracelet fixing pin |
| 0354735 | others - winding stem |
| 3F310B8098 | others - case |
| 82833700 | others - case ring |
| 3F310B80 | others - case back |
| 3F310B807Y | others - case |
| 3F310B90X914 | others - dial |
| 3F310C00XG14 | others - dial |
| 3F311 | others - machine code |
| 87020760 | others - back plate |
| 1BB050L0BCC | others - hour hand |
| EA0040B0A | others - crown and stem gasket |
| 2AB075L0BCC | others - minute hand |