The Seiko 1F21-0A20 is a watch model based on the 1F21 movement.
Parts List
| 150W02JN01 | crystal |
| 30MA2NA1 | crown - crown |
| 30MA2NS1 | crown - crown |
| 0A1400N01 | case back gasket |
| ZK60A | band - band |
| ZK59A | band - band |
| 06T38FGH | others - hour hand |
| 06T38FGM | others - minute hand |
| 06T38FNH | others - hour hand |
| 06T38FNM | others - minute hand |
| 07SC02NS | others - second hand |
| 07SC02NG | others - second hand |
| 1F210A10 | others - case back |
| 0351807 | others - winding stem |
| EZ0035B0A | others - crown and stem gasket |
| 1F210A50XS19 | others - dial |
| 1F210A50XS29 | others - dial |
| 1F219 | others - machine code |
| B090AS | others - push pin |
| 1F210A2075 | others - case |
| 82813280 | others - case ring |
| 1F210A207E | others - case |