The Seiko 1F21-5B50 is a watch model based on the 1F21 movement.
Parts List
| K00A12SN02 | crystal - crystal |
| 6K30A0SNG1 | crown |
| 0F180NA1S | case back gasket - case back gasket |
| DAA7BW | band - band |
| DAP1BW | band - band |
| 3BA075F1BNG | others - second hand |
| 2BC075A0BAA | others - minute hand |
| 1BC055A2BAA | others - hour hand |
| A110BS | others - push pin (for mb) |
| 1F211B90XG14 | others - dial |
| 1F211C00XS19 | others - dial |
| 1F215 | others - machine code |
| 1F215B50T8 | others - case |
| 1F215B5075 | others - case |
| 82834340 | others - case ring |
| 1F215B50 | others - case back |
| 1BA050A1BAF | others - hour hand |
| 0351807 | others - winding stem |
| EZ0035B01 | others - crown and stem gasket |
| 2BA075A1BAF | others - minute hand |