The Seiko 1F21-0F40 is a watch model based on the 1F21 movement.
Parts List
| 180W46SN01 | crystal |
| 35MM0NA1 | crown |
| 0A1800B01 | case back gasket |
| DK15E | band - leather band |
| DB23B | band - metal band |
| DB24B | band - metal band |
| 07SC06DG | others - second hand |
| 0351807 | others - winding stem |
| 82820520 | others - case ring |
| 1F210F40 | others - case back |
| 1F210F406Y | others - case |
| 1F210F4098 | others - case |
| 1F210H90XS14 | others - dial |
| 1F210J00XS14 | others - dial |
| 1F210J00XS24 | others - dial |
| 1F215 | others - machine code |
| A120AS | others - push pin |
| EZ0035B01 | others - crown and stem gasket |
| 1BB050A4BNG | others - hour hand |
| 1BB050L2BDG | others - hour hand |
| 2BB075A6BDG | others - minute hand |
| 2BB075L4BDG | others - minute hand |