The Seiko 1F20-5K90 is a watch model based on the 1F20 movement.
Parts List
| K01W02SK01 | crystal |
| 30MK8NA4 | crown - crown |
| 0A1500N01 | case back gasket |
| DB27B | band - metal band |
| 1CG040L0BDG | others - hour hand |
| 0351807 | others - winding stem |
| 81606439 | others - bracelet fixing pin |
| 81181459 | others - bracelet fixing pipe |
| 1F202C90XS14 | others - dial |
| 1F205 | others - machine code |
| 1F205K90 | others - case back |
| 1F205K907N | others - case |
| 82832360 | others - case ring |
| 2CG057L0BDG | others - minute hand |
| EZ0035B01 | others - crown and stem gasket |
Caliber 1F20
