The Seiko 1F21-5B2A is a watch model based on the 1F21 movement.
Parts List
| SACW46SN01 | crystal - crystal |
| 6K30A0SNG1 | crown |
| 0F180NA1S | case back gasket - case back gasket |
| 86582320 | crystal gasket - plastic gasket for crystal |
| MK53F | band - band |
| 1BB042A2BAC | others - hour hand |
| 2BB065A0BCC | others - minute hand |
| 82832240 | others - case ring |
| 0351807 | others - winding stem |
| 1F215B2A75 | others - case |
| 1F215B2A | others - case back |
| 1F210K30XG14 | others - dial |
| 1F215 | others - machine code |
| A120AS | others - push pin |
| EZ0035B01 | others - crown and stem gasket |
| 3BA080F0BNG | others - second hand |