The Seiko 1F20-1B20 is a watch model based on the 1F20 movement.
Parts List
| 160A14JC02 | crystal |
| 30MA2NA1 | crown - crown |
| 0F140NA1S | case back gasket - case back gasket |
| D054AQ | band - metal band |
| D054BQ | band - metal band |
| 1CH035S0BDG | others - hour hand |
| 0351807 | others - winding stem |
| 81606439 | others - bracelet fixing pin |
| 81190055 | others - bracelet fixing pipe |
| 82821420 | others - case ring |
| 1F201B20 | others - case back |
| 1F201B2075 | others - case |
| 1F201B207E | others - case |
| 1F202H00XS14 | others - dial |
| 1F202H00XS24 | others - dial |
| 1F205 | others - machine code |
| EZ0035B01 | others - crown and stem gasket |
| 2CH050S0BDG | others - minute hand |
Caliber 1F20
