The Seiko 1F20-5E90 is a watch model based on the 1F20 movement.
Parts List
| RECN28JN01 | crystal |
| RECN28JN | crystal |
| 30M98NA1 | crown |
| 0H1500B01 | case back gasket - case back gasket |
| 0H1500B0 | case back gasket |
| 81931941 | clasp - clasp |
| 82812900 | others - case ring |
| 1F201A50XS19 | others - dial |
| 1F205E90 | others - case back |
| 1F205E9025 | others - case |
| 1F209 | others - machine code |
| 0351807 | others - winding stem |
| DZ0041B01 | others - crown and stem gasket |
| 03Y04FGM | others - minute hand |
| 03Y10AGH | others - hour hand |
Caliber 1F20
