The Seiko 1F20-0B50 is a watch model based on the 1F20 movement.
Parts List
| 135W02SC01 | crystal |
| 30MF8NA1 | crown - crown |
| 0F130NA12 | case back gasket - case back gasket |
| TT36A | band - metal band |
| TT37A | band - metal band |
| 05Y36DGH | others - hour hand |
| 0351807 | others - winding stem |
| 81182699 | others - bracelet fixing pipe |
| 81609399 | others - bracelet fixing pin |
| 82813320 | others - case ring |
| 1F200B50 | others - case back |
| 1F200B5076 | others - case |
| 1F200B507E | others - case |
| 1F200G10XS14 | others - dial |
| 1F209 | others - machine code |
| EZ0035B01 | others - crown and stem gasket |
| 05Y36DGM | others - minute hand |
Caliber 1F20
