The Seiko 1F20-5K8B is a watch model based on the 1F20 movement.
Parts List
| ESMN12SJ03 | crystal |
| 30MK4NA6 | crown |
| 0H1610N01 | case back gasket |
| WGJ53 | band - leather band |
| 81610601 | band - bracelet fixing pin |
| 82831420 | others - case ring |
| 0351807 | others - winding stem |
| 1CF040L0BDG | others - hour hand |
| 1F202B50XG1Z | others - dial |
| 1F205 | others - machine code |
| 1F205K8B | others - case back |
| 1F205K8B25 | others - case |
| 81503901 | others - screw |
| 2CF055L0BDG | others - minute hand |
| ESMN12SJ03 | crystal |
| 30MK4NA6 | crown |
| 0H1610N01 | case back gasket |
| WGJ53 | band - leather band |
| 81610601 | band - bracelet fixing pin |
| 82831420 | others - case ring |
| 0351807 | others - winding stem |
| 1CF040L0BDG | others - hour hand |
| 1F202B50XG1Z | others - dial |
| 1F205 | others - machine code |
| 1F205K8B | others - case back |
| 1F205K8B25 | others - case |
| 81503901 | others - screw |
| 2CF055L0BDG | others - minute hand |
Caliber 1F20
