The Seiko 1F21-0AK0 is a watch model based on the 1F21 movement.
Parts List
| RE7A42SB0A | crystal - crystal |
| 6M35E4TTWA | crown - crown |
| 6M35E4TTGA | crown - crown |
| 0F160BA1S | case back gasket - case back gasket |
| DEV3BB | band - band |
| DEV4AB | band - band |
| 3BA075F1BA6 | others - second hand |
| 1BC035A1BAF | others - hour hand |
| 2BC052A1BAF | others - minute hand |
| 0351807 | others - winding stem |
| DB004BAD1 | others - crown and stem gasket |
| 1F210AK001A | others - case |
| 1F210AW0XA19 | others - dial |
| 1F215 | others - machine code |
| S130BS | others - push pin |
| 82844400 | others - case ring |
| 1F210AK0 | others - case back |
| 1F210AK002A | others - case |