The Seiko 1F21-5E3A is a watch model based on the 1F21 movement.
Parts List
| RE4A68SN02 | crystal - crystal |
| 6K35B3SNS0 | crown - crown |
| 0F180BAD2 | case back gasket - case back gasket |
| DE58BB | band - band |
| 1BH040L0BDP | others - hour hand |
| 2BH060L0BDP | others - minute hand |
| 3BA075F1BNP | others - second hand |
| 82841240 | others - case ring |
| 0351807 | others - winding stem |
| AC004BAD1 | others - crown and stem gasket |
| 1F215E3A01A | others - case |
| 1F215E3A | others - case back |
| 1F212B10XA1Z | others - dial |
| 1F215 | others - machine code |
| S150BS | others - push pin |