The Seiko 1F21-5D80 is a watch model based on the 1F21 movement.
Parts List
| RE3A20SR01 | crystal - crystal |
| 6M35B7SNW0 | crown - crown |
| 0F160BA1S | case back gasket - case back gasket |
| DD51AW | band - band |
| DD52AW | band - band |
| DD53AW | band - band |
| 1BA035A1BAK | others - hour hand |
| 3BA075F1BA6 | others - second hand |
| 1BA035A1BNS | others - hour hand |
| 3BA075F1BNS | others - second hand |
| 2BA052A1BAK | others - minute hand |
| 2BA052A1BNS | others - minute hand |
| A120BS | others - push pin (for lb) |
| 1F211K20XB13 | others - dial |
| 1F211K20XS13 | others - dial |
| 1F211K20XZ13 | others - dial |
| 1F215 | others - machine code |
| 1F215D8079 | others - case |
| 82839700 | others - case ring |
| 1F215D80 | others - case back |
| DZ0040B01 | others - crown and stem gasket |
| 0351807 | others - winding stem |