The Seiko 1F20-5K50 is a watch model based on the 1F20 movement.
Parts List
| K04N42JN01 | crystal |
| K04N42JN | crystal |
| 30M98NA1 | crown |
| 0H1200B01 | case back gasket |
| 0H1200B0 | case back gasket |
| Q5053G-LKG | band - link |
| Q5053C | band |
| Q5053C-LKG | band - link |
| Q5053G | band |
| Q5053G-BK4G | clasp - clasp |
| Q5053C-BK4G | clasp - clasp |
| 1CF032L0BDG | others - hour hand |
| 0351807 | others - winding stem |
| 81182699 | others - bracelet fixing pipe |
| 81609399 | others - bracelet fixing pin |
| 1F201J10XG14 | others - dial |
| 1F201J10XL24 | others - dial |
| 1F201J10XS24 | others - dial |
| 1F205 | others - machine code |
| 1F205K50 | others - case back |
| 1F205K5025 | others - case |
| 82821460 | others - case ring |
| Q5053C-EPG | others - endpiece |
| Q5053G-EPG | others - endpiece |
| 2CE042L0BDG | others - minute hand |
| DZ0041B01 | others - crown and stem gasket |
| 2CF045L0BDG | others - minute hand |
| 1CE030L0BDG | others - hour hand |
| 05Y32DGH | others - hour hand |
| 04Y12DGM | others - minute hand |
Caliber 1F20
