The Seiko 1F20-1B90 is a watch model based on the 1F20 movement.
Parts List
| 130A52JR03 | crystal - crystal |
| 30MA2NA1 | crown - crown |
| 0F130NA1S | case back gasket - case back gasket |
| D0A4BQ | band - band |
| D0A4CQ | band - band |
| 2CC050A0BNG | others - minute hand |
| 0351807 | others - winding stem |
| 1CC035A2BNG | others - hour hand |
| 81606439 | others - bracelet fixing pin |
| 81190055 | others - bracelet fixing pipe |
| 82813320 | others - case ring |
| 1F201B9075 | others - case |
| 1F201B90 | others - case back |
| 1F201B907E | others - case |
| 1F202J30XS14 | others - dial |
| 1F202J30XS24 | others - dial |
| 1F205 | others - machine code |
| EZ0035B01 | others - crown and stem gasket |
Caliber 1F20
