The Seiko 1F21-5B30 is a watch model based on the 1F21 movement.
Parts List
| SA0P02SN02 | crystal - crystal |
| 6K30A0SNG1 | crown |
| 0F180NA1S | case back gasket - case back gasket |
| 86582400 | crystal gasket - plastic gasket for crystal |
| DAP2BW | band - band |
| 1BB037A0BAC | others - hour hand |
| 1BH040A0BAA | others - hour hand |
| 2BB060A2BAC | others - minute hand |
| 2BH060A0BAA | others - minute hand |
| A120BS | others - push pin (for lb) |
| 1F211A10XG14 | others - dial |
| 1F211A20XS14 | others - dial |
| 1F215 | others - machine code |
| 1F215B3075 | others - case |
| 82833660 | others - case ring |
| 1F215B30 | others - case back |
| 0351807 | others - winding stem |
| EZ0035B01 | others - crown and stem gasket |
| 3BA080F0BNG | others - second hand |