The Seiko 1F20-1D90 is a watch model based on the 1F20 movement.
Parts List
| 120A02JN02 | crystal - crystal |
| 6M30Y9SNS0 | crown - crown |
| 6M3008SNW1 | crown - crown |
| 0F120BA1S | case back gasket - case back gasket |
| W310AZ | band - band |
| WBX4AW | band - band |
| WBX5AW | band - band |
| WCF7AW | band - band |
| WCF8AW | band - leather band |
| 1C0025A7BNA | others - hour hand |
| 2C0032A5BNA | others - minute hand |
| 1CH030A1BNS | others - hour hand |
| 2CH045A1BNS | others - minute hand |
| 1CH032A0BNG | others - hour hand |
| A100BS | others - push pin (for mb) |
| 1F200520XS13 | others - dial |
| 1F205 | others - machine code |
| 1F20HAB0HS13 | others - dial |
| 1F20HAB0HZ13 | others - dial |
| 1F20HAD0HG14 | others - dial |
| 1F201D90 | others - case back |
| DZ0040B01 | others - crown and stem gasket |
| 0351807 | others - winding stem |
| 82852190 | others - case ring |
| 1F201D9001A | others - case |
| 1F201D9001H | others - case |
| 2CH045A0BNG | others - minute hand |
Caliber 1F20
