The Seiko 1F21-0AY0 is a watch model based on the 1F21 movement.
Parts List
| RE7A78HE0A | crystal - crystal (inorganic) |
| 6K40C4SNW1 | crown - crown (3h) |
| 0F170BAD2 | case back gasket - case back gasket |
| DFV1AW | band - band |
| D323AG | band - metal band |
| D323AG-LK00 | band - link |
| DFV0AW | band - leather band |
| D323AG-BK00 | clasp - clasp |
| 3BA075F0BNS | others - second hand |
| 1BX035S0BDS | others - hour hand |
| 2BX052S0BDS | others - minute hand |
| 82845380 | others - case ring |
| AC004BAD1 | others - crown and stem gasket |
| 0351807 | others - winding stem |
| 1F210AY002A | others - case |
| 1F210AY0 | others - case back |
| 1F210BH0XS13 | others - dial |
| 1F215 | others - machine code |
| D323AG-LKPC | others - pipe for link |
| D323AG-LKPN | others - pin for link |