The Seiko 1F21-5B80 is a watch model based on the 1F21 movement.
Parts List
| SA0A74SN02 | crystal - crystal |
| 30MA2NA1 | crown - crown |
| 0F160NA1S | case back gasket - case back gasket |
| DAS2BW | band - band |
| DAS1BW | band - leather band |
| 2BC060A1BAA | others - minute hand |
| 3BA075F0BNG | others - second hand |
| 1BC040A1BAA | others - hour hand |
| A100BS | others - push pin (for mb) |
| 1F211E30XS14 | others - dial |
| 1F211E40XS19 | others - dial |
| 1F215 | others - machine code |
| 1F215B8075 | others - case |
| 82835940 | others - case ring |
| 1F215B80 | others - case back |
| 1BA040A1BNG | others - hour hand |
| 0351807 | others - winding stem |
| EZ0035B01 | others - crown and stem gasket |
| 2BA060A1BNG | others - minute hand |