The Seiko 1F21-0AJ0 is a watch model based on the 1F21 movement.
Parts List
| SA2A42SB0A | crystal - crystal |
| 6M35E4TTGA | crown - crown |
| 6M35E4TTWA | crown - crown |
| 0F180BA1S | case back gasket - case back gasket |
| DEV6AB | band - band |
| DEV5BB | band - band |
| 2BC060A1BAL | others - minute hand |
| 3BA075F1BA6 | others - second hand |
| 1BC042A1BAL | others - hour hand |
| A110BS | others - push pin (for mb) |
| 1F210AX0XS19 | others - dial |
| 1F210AX0XS29 | others - dial |
| 1F215 | others - machine code |
| 82844380 | others - case ring |
| 1F210AJ0 | others - case back |
| 1F210AJ002A | others - case |
| 0351807 | others - winding stem |
| DB004BAD1 | others - crown and stem gasket |
| 1F210AJ001A | others - case |