The Seiko 1F21-0J40 is a watch model based on the 1F21 movement.
Parts List
| 150A02SN02 | crystal - crystal |
| 30MA2NA1 | crown - crown |
| 0F140NA1S | case back gasket - case back gasket |
| D022BQ | band - metal band |
| 1BF040L0BDG | others - hour hand |
| 0351807 | others - winding stem |
| 81606439 | others - bracelet fixing pin |
| 81180229 | others - bracelet fixing pipe |
| 82813280 | others - case ring |
| 1F210J40 | others - case back |
| 1F210J4075 | others - case |
| 1F211C90XB14 | others - dial |
| 1F215 | others - machine code |
| EZ0035B01 | others - crown and stem gasket |
| 2BF057L0BDG | others - minute hand |
| 3BA080F0BNG | others - second hand |