The Seiko 1F21-0L20 is a watch model based on the 1F21 movement.
Parts List
| 160A18JZ0D | crystal - crystal |
| 30ML2NS1 | crown - crown |
| 0F130BA1S | case back gasket - case back gasket |
| 4904JZ-LK2 | band - link |
| 4904JZ | band - band |
| 4904JZ-BKK | clasp - buckle |
| 1BA037A7BNS | others - hour hand |
| 2BA055A5BNS | others - minute hand |
| 3BA075F1BNS | others - second hand |
| 0351807 | others - winding stem |
| 81606439 | others - bracelet fixing pin |
| 81190875 | others - bracelet fixing pipe |
| 82813320 | others - case ring |
| 1F210L2079Z | others - case |
| 1F210L20 | others - case back |
| 1F211K88XL13 | others - dial |
| 1F215 | others - machine code |
| EZ0035B01 | others - crown and stem gasket |