The Seiko 1F21-1B3A is a watch model based on the 1F21 movement.
Parts List
| 195W38SK01 | crystal - crystal |
| 35MJ2NA2 | crown - crown |
| 0A1900B01 | case back gasket - gasket |
| MK23F | band - band |
| 1F211B3A76 | others - case |
| 1F211B3A | others - case back |
| 1F211B60XG14 | others - dial |
| 1F213 | others - machine code |
| 87020460 | others - back plate |
| A120AS | others - push pin |
| 0351807 | others - winding stem |
| 82821200 | others - case ring |
| 07TA4NGM | others - minute hand |
| EZ0035B01 | others - crown and stem gasket |
| 08SC22D1 | others - second hand |
| 08T24N1H | others - hour hand |