The Seiko 1F20-5E40 is a watch model based on the 1F20 movement.
Parts List
| RE7N34GN00 | crystal |
| 30M98NS1 | crown - crown |
| 0H1400B01 | case back gasket - case back gasket |
| DK11C | band - leather band |
| MK22C | band - leather band |
| 0351807 | others - winding stem |
| 82812160 | others - case ring |
| 1F200K50XN13 | others - dial |
| 1F205E40 | others - case back |
| 1F205E4011 | others - case |
| 1F209 | others - machine code |
| A320CS | others - push pin |
| 04Y06DSM | others - minute hand |
| DZ0041B01 | others - crown and stem gasket |
| 04Y06NCH | others - hour hand |
Caliber 1F20
