The Seiko 1F20-1C50 is a watch model based on the 1F20 movement.
Parts List
| ES1A34SZ0C | crystal - crystal |
| ES1A34SZ0D | crystal - crystal |
| 25M18NA1 | crown |
| 0F170NA1S | case back gasket - case back gasket |
| C035CM | band - band |
| C036BM | band - band |
| 1CA055A2BAE | others - hour hand |
| 2CA080A0BDG | others - minute hand |
| 0351807 | others - winding stem |
| 81606439 | others - bracelet fixing pin |
| 81190055 | others - bracelet fixing pipe |
| 82822260 | others - case ring |
| 1F201C5075 | others - case |
| 86520144 | others - decorative plate |
| 1F201C50 | others - case back |
| 1F201C50SA | others - case |
| 86520145 | others - decorative plate |
| 1F202L80XN14 | others - dial |
| 1F202L80XS14 | others - dial |
| 1F205 | others - machine code |
| EZ0035B01 | others - crown and stem gasket |
Caliber 1F20
