The Seiko 1F21-0J20 is a watch model based on the 1F21 movement.
Parts List
| 190W48SK01 | crystal |
| 35M1NNA1 | crown |
| 0F190NA1S | case back gasket - case back gasket |
| 86581860 | crystal gasket - plastic gasket for crystal |
| DB43B | band - metal band |
| A120BS | others - push pin (for lb) |
| 1F210J20 | others - case back |
| 1F210J206Y | others - case |
| 1F211C80XS14 | others - dial |
| 1F215 | others - machine code |
| 87020460 | others - back plate |
| 82820780 | others - case ring |
| 1BG055L0BCC | others - hour hand |
| 0351807 | others - winding stem |
| EA0040B0A | others - crown and stem gasket |
| 2BG080L0BCC | others - minute hand |
| 3BA080F0BNG | others - second hand |