The Seiko 1F21-5F50 is a watch model based on the 1F21 movement.
Parts List
| K00A10SB0A | crystal - crystal |
| 6M25Z7NDGA | crown - crown |
| 6M25Z7SNWB | crown - crown |
| 0F170BA1S | case back gasket - case back gasket |
| DEA8AW | band - band |
| DEN0AW | band - band |
| DEA7BW | band - band |
| DEN1BW | band - band |
| DEA8AW-BJ00 | clasp - buckle |
| 07SC06DP | others - second hand |
| 1BC037A1BNG | others - hour hand |
| 1BC037A1BNP | others - hour hand |
| 1BC037A1BNS | others - hour hand |
| 2BC055A1BNG | others - minute hand |
| 2BC055A1BNP | others - minute hand |
| 2BC055A1BNS | others - minute hand |
| 1F215F5001A | others - case |
| 82842980 | others - case ring |
| 1F215F50 | others - case back |
| 07SC06DG | others - second hand |
| 07SC06DS | others - second hand |
| DZ0040B01 | others - crown and stem gasket |
| 0351807 | others - winding stem |
| 1F215F5002A | others - case |
| 1F210AA0XA13 | others - dial |
| 1F210AB0XA19 | others - dial |
| 1F210AB0XA29 | others - dial |
| 1F210AB0XA39 | others - dial |
| 1F215 | others - machine code |
| A100AS | others - push pin |