The Seiko 1F21-5A20 is a watch model based on the 1F21 movement.
Parts List
| K00W80SN01 | crystal - crystal |
| 30MA2NA1 | crown - crown |
| 0F130NA12 | case back gasket - case back gasket |
| HK64B | band - band |
| HK63B | band - leather band |
| 07SC02NG | others - second hand |
| 05T38AGH | others - hour hand |
| 05T38AGM | others - minute hand |
| 82813420 | others - case ring |
| 05T36NGH | others - hour hand |
| 0351807 | others - winding stem |
| T080AS | others - push pin |
| 1F215A2075 | others - case |
| 1F215A20 | others - case back |
| 1F210A60XG14 | others - dial |
| 1F210A70XS19 | others - dial |
| 1F219 | others - machine code |
| EZ0035B01 | others - crown and stem gasket |
| 05T36NGM | others - minute hand |