The Seiko 1F20-5B90 is a watch model based on the 1F20 movement.
Parts List
| K04N04JN01 | crystal |
| K04N04JN | crystal |
| 30M98NA1 | crown |
| 0H1300B01 | case back gasket |
| 0H1300B0 | case back gasket |
| Z5324C | band |
| Z5324C-LKG | band - link |
| Z5324G-LKG | band - link |
| Z5324G | band |
| Z5324G-BK4G | clasp - clasp |
| Z5324C-BK4G | clasp - clasp |
| 0351807 | others - winding stem |
| 1F200E30XS14 | others - dial |
| 1F200E40XB14 | others - dial |
| 1F200E40XG14 | others - dial |
| 1F200E40XG24 | others - dial |
| 1F205B90 | others - case back |
| 1F205B9025 | others - case |
| 1F205B902H | others - case |
| 1F209 | others - machine code |
| 82813040 | others - case ring |
| T060AS | others - push pin |
| 04Y06NGM | others - minute hand |
| DZ0041B01 | others - crown and stem gasket |
| 04Y02DAM | others - minute hand |
| 04Y02DAH | others - hour hand |
| 04Y06NGH | others - hour hand |
Caliber 1F20
