The Seiko 1F21-1A20 is a watch model based on the 1F21 movement.
Parts List
| 190W24SN01 | crystal |
| 30MA2NA1 | crown - crown |
| 0A1800B01 | case back gasket |
| HK68B | band - band |
| DK11D | band - band |
| 07TF0AGH | others - hour hand |
| 07SC02NG | others - second hand |
| 0351807 | others - winding stem |
| 07SC02AB | others - second hand |
| 82820520 | others - case ring |
| 1F211A2075 | others - case |
| 1F211A20 | others - case back |
| 1F211B20XS19 | others - dial |
| 1F211B30XS29 | others - dial |
| 1F219 | others - machine code |
| A120AS | others - push pin |
| 07TF0NBH | others - hour hand |
| EZ0035B01 | others - crown and stem gasket |
| 07TF0NBM | others - minute hand |
| 07TA0FGM | others - minute hand |