The Seiko 1F21-5A50 is a watch model based on the 1F21 movement.
Parts List
| K00W82HR01 | crystal |
| 38M18NA1 | crown |
| 0F140BAAS | case back gasket - case back gasket |
| 86581320 | case back gasket |
| DB51A | band - metal band |
| 07SC02NG | others - second hand |
| 0351807 | others - winding stem |
| 04T12NGH | others - hour hand |
| 1F210B50XS14 | others - dial |
| 1F215A50 | others - case back |
| 1F215A50SA | others - case |
| 1F219 | others - machine code |
| 82814240 | others - case ring |
| 04T12NGM | others - minute hand |
| EA0040B0A | others - crown and stem gasket |