The Seiko 1F21-5B70 is a watch model based on the 1F21 movement.
Parts List
| K00A28SR02 | crystal - crystal |
| 40MG6NH1 | crown - crown |
| 40MG6NN1 | crown - crown |
| 0F130BA1S | case back gasket - case back gasket |
| 0F190BA1S | case back gasket - case back gasket |
| DAV6AB | band - band |
| DAT9BW | band - band |
| DAV3BB | band - leather band |
| DAV4AB | band - leather band |
| DAV1AW | band - band |
| 3BA075F1BA6 | others - second hand |
| 1BA042A1BAK | others - small hand(12h) |
| 2BA062A1BAK | others - minute hand |
| 0351807 | others - winding stem |
| 1F215B7075 | others - case |
| 1F211E20XS14 | others - dial |
| 1F211E20XS24 | others - dial |
| 1F215 | others - machine code |
| 87020460 | others - back plate |
| A120AS | others - push pin |
| 1F215B7071 | others - case |
| 82835820 | others - case ring |
| 1F215B70 | others - case back |
| EZ0035B01 | others - crown and stem gasket |