The Seiko 3F31-0C30 is a watch model based on the 3F31 movement.
Parts List
| 190P08SZ0C | crystal - crystal |
| 30ML0TB4 | crown - crown |
| 0F190NAAS | case back gasket - case back gasket |
| 86574900 | crystal gasket |
| D0C7AM | band - band |
| 1BH055A0BNG | others - hour hand |
| 2BH075A1BDG | others - minute hand |
| 3AA125FMANG | others - second hand |
| A120BS | others - push pin (for lb) |
| 3F310C80XL14 | others - dial |
| 3F311 | others - machine code |
| 87020760 | others - back plate |
| 0354735 | others - winding stem |
| 3F310C3061 | others - case |
| 82834860 | others - case ring |
| 3F310C30 | others - case back |
| EZ0035B01 | others - crown and stem gasket |