The Seiko 1F21-0D40 is a watch model based on the 1F21 movement.
Parts List
| 185W04SN01 | crystal |
| 35M0PNA1 | crown |
| 35M0RNE1 | crown |
| 0A1700N0A | case back gasket |
| 86574381 | crystal gasket |
| Z5411 | band - metal band |
| Z5412 | band - metal band |
| 1BB050A0BLG | others - hour hand |
| 0351807 | others - winding stem |
| 07SC06DG | others - second hand |
| 81180229 | others - bracelet fixing pipe |
| 81604259 | others - bracelet fixing pin |
| 1F210D40 | others - case back |
| 1F210D409G | others - case |
| 1F210D40SA | others - case |
| 1F210E9LXB14 | others - dial |
| 1F210E9LXS14 | others - dial |
| 1F210E9LXS24 | others - dial |
| 1F215 | others - machine code |
| 82823700 | others - case ring |
| EA0040B0A | others - crown and stem gasket |
| 2BB072A0BLG | others - minute hand |
| 3EA075A0BDG | others - second hand |