The Seiko 1F21-1B10 is a watch model based on the 1F21 movement.
Parts List
| 145W06SK01 | crystal |
| 25M12NA1 | crown |
| 0F130NA12 | case back gasket - case back gasket |
| 81180581 | band - bracelet fixing pipe |
| 86502883 | others - decorative plate |
| 81604321 | others - bracelet fixing pin |
| 82821000 | others - case ring |
| 1F211B10 | others - case back |
| 1F211B1061 | others - case |
| 1F211B50XS34 | others - dial |
| 1F219 | others - machine code |
| 0351807 | others - winding stem |
| 05T42DGH | others - hour hand |
| 05T42DGM | others - minute hand |
| EZ0035B01 | others - crown and stem gasket |
| 06SC21VG | others - second hand |