The Seiko 1F20-5120 is a watch model based on the 1F20 movement.
Parts List
| K01A87SN01 | crystal - crystal (sapphire) |
| 6M27A1SNG0 | crown - crown |
| 6M27A1SNW0 | crown |
| 0F150BA1S | case back gasket - case back gasket |
| DAY1BW | band - band |
| DAX9AW | band - band |
| 81503607 | band - other |
| 1CH047A1BNG | others - hour hand |
| 2CH070A1BDG | others - minute hand |
| 1CH047A1BAM | others - hour hand |
| 2CH070A1BAM | others - minute hand |
| 82871270 | others - case ring |
| 0351107 | others - winding stem |
| 0351807 | others - winding stem |
| 1F2051202EA | others - case |
| 81611349 | others - bracelet fixing pin |
| 1F200310XG19 | others - dial |
| 1F200320XS19 | others - dial |
| 1F203 | others - machine code |
| 81501609 | others - screw |
| 1F20512025A | others - case |
| 81611341 | others - bracelet fixing pin |
| 1F205120 | others - case back |
| 81503609 | others - screw |
| DZ0040B01 | others - crown and stem gasket |
Caliber 1F20
