The Seiko 1F20-5A20 is a watch model based on the 1F20 movement.
Parts List
| K02N36JN | crystal |
| K02N36JN01 | crystal |
| 30M98NA1 | crown |
| 0H1200N01 | case back gasket |
| 0H1200N0 | case back gasket |
| DZ0041B0 | case back gasket |
| G5111G-LKG | band - link |
| G5111G | band - metal band |
| G5111G-BK4G | clasp - clasp |
| 0351807 | others - winding stem |
| 81182699 | others - bracelet fixing pipe |
| 81609399 | others - bracelet fixing pin |
| 1F200A50XB14 | others - dial |
| 1F200A50XG14 | others - dial |
| 1F200A50XS14 | others - dial |
| 1F205A20 | others - case back |
| 1F205A2025 | others - case |
| 1F209 | others - machine code |
| 82812880 | others - case ring |
| 04Y06NGM | others - minute hand |
| DZ0041B01 | others - crown and stem gasket |
| 04Y06NGH | others - hour hand |
Caliber 1F20
