The Seiko 1F20-5K20 is a watch model based on the 1F20 movement.
Parts List
| K05N02JU01 | crystal |
| K05N02JU | crystal |
| 30M98NA1 | crown |
| 0H1300B01 | case back gasket |
| 0H1300B0 | case back gasket |
| B5654C | band |
| B5654C-LKG | band - link |
| B5654C-BK4G | clasp - clasp |
| 1CF032L0BDG | others - hour hand |
| 04V32DGH | others - hour hand |
| 0351807 | others - winding stem |
| 81182699 | others - bracelet fixing pipe |
| 81609499 | others - bracelet fixing pin |
| 1F202A70XS14 | others - dial |
| 1F205 | others - machine code |
| 1F205K20 | others - case back |
| 1F205K202N | others - case |
| 82824960 | others - case ring |
| 2CF045L0BDG | others - minute hand |
| DZ0041B01 | others - crown and stem gasket |
| 04Y32DGM | others - minute hand |
Caliber 1F20
